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A fuzzer that generates random Go programs

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microsmith generates random (but always valid) Go programs that can be
used to stress-test Go compilers.

#### Bugs found

##### Go Compiler

- [#23504 internal compiler error: panic during layout](https://github.com/golang/go/issues/23504)
- [#23889 panic: branch too far on arm64](https://github.com/golang/go/issues/23889)
- [#25006 compiler hangs on tiny program](https://github.com/golang/go/issues/25006)
- [#25269 compiler crashes with "stuck in spanz loop" error on s390x with -N](https://github.com/golang/go/issues/25269)
- [#25526 internal compiler error: expected branch at write barrier block](https://github.com/golang/go/issues/25516)
- [#25741 internal compiler error: not lowered: v15, OffPtr PTR64 PTR64](https://github.com/golang/go/issues/25741)
- [#25993 internal compiler error: bad AuxInt value with ssacheck enabled](https://github.com/golang/go/issues/25993)
- [#26024 internal compiler error: expected successors of write barrier block to be plain](https://github.com/golang/go/issues/26024)
- [#26043 internal compiler error: panic during prove](https://github.com/golang/go/issues/26043)
- [#28055 compiler crashes with "VARDEF is not a top level statement" error](https://github.com/golang/go/issues/28055)
- [#29215 internal compiler error: panic during lower](https://github.com/golang/go/issues/29215)
- [#29218 internal compiler error: bad live variable at entry](https://github.com/golang/go/issues/29218)
- [#30257 internal compiler error: panic during lower II](https://github.com/golang/go/issues/30257)
- [#30679 internal compiler error: panic during lower (unreachable)](https://github.com/golang/go/issues/30679)
- [#31915 internal compiler error: val is in reg but not live](https://github.com/golang/go/issues/31915)
- [#32454 internal compiler error: bad live variable at entry II](https://github.com/golang/go/issues/32454)
- [#33903 internal compiler error: panic during short circuit](https://github.com/golang/go/issues/33903)
- [#34520 panic: First time we've seen filename](https://github.com/golang/go/issues/34520)
- [#35157 internal compiler error: aliasing constant which is not registered](https://github.com/golang/go/issues/35157)
- [#35695 panic: Assigning a bogus line to XPos with no file](https://github.com/golang/go/issues/35695)
- [#38359 internal compiler error: can't encode a NaN in AuxInt field](https://github.com/golang/go/issues/38359)
- [#38916 internal compiler error: schedule does not include all values](https://github.com/golang/go/issues/38916)
- [#38946 panic: log2 of 0 on arm64](https://github.com/golang/go/issues/38946)
- [#39472 internal compiler error: schedule does not include all values in block](https://github.com/golang/go/issues/39472)
- [#39505 internal compiler error: Flag* ops should never make it to codegen](https://github.com/golang/go/issues/39505)
- [#42587 illegal combination SRA ADDCON REG REG on mips](https://github.com/golang/go/issues/42587)
- [#42610 internal compiler error: PPC64 shift arg mb out of range](https://github.com/golang/go/issues/42610)
- [#43099 internal compiler error: panic during lower (integer divide by zero)](https://github.com/golang/go/issues/43099)
- [#43701 panic: invalid memory address or nil pointer dereference](https://github.com/golang/go/issues/43701)
- [#44465 internal compiler error: arg 1 does not dominate](https://github.com/golang/go/issues/44465)
- [#45359 internal compiler error: FlagConstant op should never make it to codegen](https://github.com/golang/go/issues/45359)
- [#45589 internal compiler error: Invalid PPC64 rotate mask](https://github.com/golang/go/issues/45589)
- [#45693 internal compiler error: bad live variable at entry](https://github.com/golang/go/issues/45693)
- [#47684 internal compiler error: misuse of CaptureName](https://github.com/golang/go/issues/47684)
- [#47723 internal compiler error: .dict already has a location](https://github.com/golang/go/issues/47723)
- [#48026 internal compiler error: arg does not dominate](https://github.com/golang/go/issues/48026)
- [#48191 data race in compiler building generic program](https://github.com/golang/go/issues/48191)
- [#49122 internal compiler error: can't find source for MOVBload](https://github.com/golang/go/issues/49122)
- [#49242 internal compiler error: found illegal assignment](https://github.com/golang/go/issues/49242)
- [#49249 internal compiler error: panic during expand calls](https://github.com/golang/go/issues/49249)
- [#49282 internal compiler error: Op...LECall and OpDereference have mismatched mem](https://github.com/golang/go/issues/49282)
- [#49378 internal compiler error: Expand calls interface data problem](https://github.com/golang/go/issues/49378)
- [#49619 cmd/link: panic: index out of range](https://github.com/golang/go/issues/49619)
- [#52124 internal compiler error: panic: unexpected type: 10](https://github.com/golang/go/issues/52124)
- [#52907 internal compiler error: dictionary variable not captured by value](https://github.com/golang/go/issues/52907)
- [#53018 internal compiler error: panic during lower in linux/loong64](https://github.com/golang/go/issues/53018)
- [#53390 internal compiler error: assertion failed](https://github.com/golang/go/issues/53390)
- [#53439 internal compiler error: found illegal assignment](https://github.com/golang/go/issues/53439)
- [#54542 internal compiler error on mismatch between -p value and pkg name](https://github.com/golang/go/issues/54542)
- [#58161 internal compiler error: two final stores](https://github.com/golang/go/issues/58161)
- [#59174 internal compiler error: not lowered: v108, Zero SSA PTR SSA](https://github.com/golang/go/issues/59174)
- [#60990 internal compiler error: mismatched mem](https://github.com/golang/go/issues/60990)
- [#60991 internal compiler error: assertion failed](https://github.com/golang/go/issues/60991)
- [#61041 internal compiler error: not lowered: v654, Int64Hi INT32 INT](https://github.com/golang/go/issues/61041)
- [#61127 internal compiler error: panic on clear of empty struct slice](https://github.com/golang/go/issues/61127)
- [#61486 internal compiler error: panic: builtins.go: assertion failed](https://github.com/golang/go/issues/61486)
- [#61778 internal compiler error:  value .autotmp_1 incorrectly live at entry](https://github.com/golang/go/issues/61778)
- [#61819 16 bit-width, short branch too far on loong64](https://github.com/golang/go/issues/61819)
- [#61895 internal compiler error: unexpected frame offset for open-coded defer](https://github.com/golang/go/issues/61895)
- [#61908 internal compiler error: missed typecheck](https://github.com/golang/go/issues/61908)
- [#61992 internal compiler error: startMem[b1] has different values](https://github.com/golang/go/issues/61992)
- [#62515 internal compiler error: unused auto: .autotmp_4](https://github.com/golang/go/issues/62515)
- [#62698 internal compiler error: Invalid PPC64 rotate mask](https://github.com/golang/go/issues/62698)
- [#63378 internal compiler error on range over negative integer](https://github.com/golang/go/issues/63378)
- [#63462 internal compiler error: panic during expand calls on ARM](https://github.com/golang/go/issues/63462)
- [#68816 internal compiler error: panic during prove](https://github.com/golang/go/issues/68816)
- [#73180 illegal combination ADD $8, ZR, R2 on arm64](https://github.com/golang/go/issues/73180)
- [#75617 internal compiler error: bad conversion to untyped](https://github.com/golang/go/issues/75617)
- [#77635 internal compiler error: cannot represent parameters of type struct](https://github.com/golang/go/issues/77635)
- [#77815 internal compiler error: bad write barrier type [4]struct {}](https://github.com/golang/go/issues/77815)
- [#77868 internal compiler error: zero for tpye [2]int not implemented](https://github.com/golang/go/issues/77868)
- [#79274 internal compiler error: panic: invalid memory address](https://github.com/golang/go/issues/79274)
- [#80096 internal compiler error: missing typecheck](https://github.com/golang/go/issues/80096)
- [#80543 internal compiler error: zero-sized Make; use Empty instead](https://github.com/golang/go/issues/80543)

##### gccgo

- [#44383 internal compiler error: Segmentation fault during GIMPLE pass ealias](https://github.com/golang/go/issues/44383)
- [#47130 internal compiler error: in write_equal_function](https://github.com/golang/go/issues/47130)
- [#56109 gccgo rejects valid program](https://github.com/golang/go/issues/56109)
- [#56113 internal compiler error: in gen_reg_rtx, at emit-rtl](https://github.com/golang/go/issues/56113)
- [#63495 error: esc already decorated call](https://github.com/golang/go/issues/63495)

##### tinygo

- [#1653 LLVM ERROR: Cannot select: intrinsic %llvm.coro.size](https://github.com/tinygo-org/tinygo/issues/1653)
- [#2749 panic: integer divide by zero on array of zero-sized elems](https://github.com/tinygo-org/tinygo/issues/2749)
- [#2777 panic: compiler SIGSEGVs in transform.OptimizeAllocs call tree](https://github.com/tinygo-org/tinygo/issues/2777)
- [#3083 panic: unknown type: chan int](https://github.com/tinygo-org/tinygo/issues/3083)
- [#4214 panic: interp: load out of bounds](https://github.com/tinygo-org/tinygo/issues/4214)
- [#4441 panic: *ssa.opaqueType: deferStack](https://github.com/tinygo-org/tinygo/issues/4441)

microsmith

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