cmd/7g: use HINT in ginscall (again)
cmd/7g: use HINT in ginscall (again)

Change-Id: I28acc8ecf4cef96fb065bebaf8d54716a7b6e413

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