cmd/compile: remove unused Bputname function

Change-Id: Icecbf9bae8c39670d1ceef62dd94b36e90b27b04
Reviewed-on: https://go-review.googlesource.com/22570
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/compile/internal/gc/obj.go

@@ -138,11 +138,6 @@ func dumpglobls() {
 	funcsyms = nil
 }
 
-func Bputname(b *bio.Writer, s *obj.LSym) {
-	b.WriteString(s.Name)
-	b.WriteByte(0)
-}
-
 func Linksym(s *Sym) *obj.LSym {
 	if s == nil {
 		return nil