cmd/internal/obj: remove unused Getcallerpc function

Change-Id: I0c7b677657326f318e906e109cbda0cfa78c4973
Reviewed-on: https://go-review.googlesource.com/37537
Run-TryBot: Matthew Dempsky <mdempsky@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>

src/cmd/internal/obj/util.go

@@ -181,10 +181,6 @@ func (ctxt *Link) freeProgs() {
 	ctxt.allocIdx = 0
 }
 
-func Getcallerpc(interface{}) uintptr {
-	return 1
-}
-
 func (ctxt *Link) Dconv(a *Addr) string {
 	return Dconv(nil, a)
 }