PR go/85429
    cmd/go: add Solaris assembler syntax for gccgo buildid file
    
    The Solaris assembler uses a different syntax for section directives.
    
    This is https://golang.org/cl/109140 ported over to gccgo.
    
    Reviewed-on: https://go-review.googlesource.com/109141

From-SVN: r259719