Revert "cmd/internal/obj: fix inline marker issue on s390x"

This reverts CL 247697.

Reason for revert: This change broke the linux-arm builder.

Change-Id: I8ca0d5b3b2ea0109ffbfadeab1406a1b60e7d18d
Reviewed-on: https://go-review.googlesource.com/c/go/+/248718
Reviewed-by: Michael Munday <[email protected]>
Run-TryBot: Michael Munday <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: aclements

src/cmd/internal/obj/pcln.go

@@ -278,21 +278,6 @@ func linkpcln(ctxt *Link, cursym *LSym) {
 	funcpctab(ctxt, &pcln.Pcfile, cursym, "pctofile", pctofileline, pcln)
 	funcpctab(ctxt, &pcln.Pcline, cursym, "pctoline", pctofileline, nil)
 
-	// Check that all the Progs used as inline markers are still reachable.
-	// See issue #40473.
-	inlMarkProgs := make(map[*Prog]struct{}, len(cursym.Func.InlMarks))
-	for _, inlMark := range cursym.Func.InlMarks {
-		inlMarkProgs[inlMark.p] = struct{}{}
-	}
-	for p := cursym.Func.Text; p != nil; p = p.Link {
-		if _, ok := inlMarkProgs[p]; ok {
-			delete(inlMarkProgs, p)
-		}
-	}
-	if len(inlMarkProgs) > 0 {
-		ctxt.Diag("one or more instructions used as inline markers are no longer reachable")
-	}
-
 	pcinlineState := new(pcinlineState)
 	funcpctab(ctxt, &pcln.Pcinline, cursym, "pctoinline", pcinlineState.pctoinline, nil)
 	for _, inlMark := range cursym.Func.InlMarks {

src/cmd/internal/obj/s390x/objz.go

@@ -283,6 +283,17 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
 			ACMPUBNE:
 			q = p
 			p.Mark |= BRANCH
+			if p.Pcond != nil {
+				q := p.Pcond
+				for q.As == obj.ANOP {
+					q = q.Link
+					p.Pcond = q
+				}
+			}
+
+		case obj.ANOP:
+			q.Link = p.Link /* q is non-nop */
+			p.Link.Mark |= p.Mark
 
 		default:
 			q = p