runtime: more go vet fixes
runtime: more go vet fixes

: xgene:runtime; go tool vet -asmdecl `go list -f '{{join .GoFiles " "}}' runtime` `ls *arm64.s`
asm_arm64.s:31: [arm64] memeq: invalid MOV of ret+24(FP); bool is 1-byte value
:

frobware/go,frobware/go,frobware/go,frobware/go,frobware/go,frobware/go,frobware/go