cmd/compile,cmd/asm: fix buglet in -S=2 output

In CL 255718 the -S=2 assembly output was enhanced to dump symbol
ABIs. This patch fixes a bug in that CL: when dumping the relocations
on a symbol, we were dumping the symbol's ABI as opposed to the
relocation target symbol's ABI.

Change-Id: I134128687757f549fa37b998cff1290765889140
Reviewed-on: https://go-review.googlesource.com/c/go/+/257202
Trust: Than McIntosh <[email protected]>
Run-TryBot: Than McIntosh <[email protected]>
Reviewed-by: David Chase <[email protected]>
Reviewed-by: Cherry Zhang <[email protected]>
TryBot-Result: Go Bot <[email protected]>

Author: thanm

src/cmd/internal/obj/objfile.go

@@ -734,7 +734,7 @@ func (ctxt *Link) writeSymDebugNamed(s *LSym, name string) {
 		if r.Sym != nil {
 			name = r.Sym.Name
 			if ctxt.Debugasm > 1 {
-				ver = fmt.Sprintf("<%d>", s.ABI())
+				ver = fmt.Sprintf("<%d>", r.Sym.ABI())
 			}
 		} else if r.Type == objabi.R_TLS_LE {
 			name = "TLS"