runtime: remove unused printpc and printbyte functions

Change-Id: I40e338f6b445ca72055fc9bac0f09f0dca904e3a
Reviewed-on: https://go-review.googlesource.com/16191Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/print.go

@@ -71,10 +71,6 @@ func printnl() {
 	print("\n")
 }
 
-func printpc(p unsafe.Pointer) {
-	print("PC=", hex(uintptr(p)))
-}
-
 func printbool(v bool) {
 	if v {
 		print("true")
@@ -83,10 +79,6 @@ func printbool(v bool) {
 	}
 }
 
-func printbyte(c byte) {
-	gwrite((*[1]byte)(unsafe.Pointer(&c))[:])
-}
-
 func printfloat(v float64) {
 	switch {
 	case v != v: