cmd/compile: cleanup artifacts from previous CL

Does not pass toolstash, but only because it causes ATYPE instructions
to be emitted in a different order, and it avoids emitting type
metadata for unused variables.

Change-Id: I3ec8f66a40b5af9213e0d6e852b267a8dd995838
Reviewed-on: https://go-review.googlesource.com/30217
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/pgen.go

@@ -262,12 +262,6 @@ func (s *ssaExport) AllocFrame(f *ssa.Func) {
 		}
 	}
 
-	// To satisfy toolstash -cmp, preserve the unsorted
-	// declaration order so we can emit the ATYPE instructions in
-	// the same order.
-	// TODO(mdempsky): Remove in followup CL.
-	Curfn.Func.UnsortedDcls = append([]*Node(nil), Curfn.Func.Dcl...)
-
 	if f.Config.NeedsFpScratch {
 		scratchFpMem = temp(Types[TUINT64])
 		scratchFpMem.Used = scratchUsed
@@ -432,18 +426,13 @@ func compile(fn *Node) {
 		}
 	}
 
-	for _, n := range fn.Func.UnsortedDcls {
+	for _, n := range fn.Func.Dcl {
 		if n.Op != ONAME { // might be OTYPE or OLITERAL
 			continue
 		}
 		switch n.Class {
 		case PAUTO:
 			if !n.Used {
-				// Hacks to appease toolstash -cmp.
-				// TODO(mdempsky): Remove in followup CL.
-				pcloc++
-				Pc.Pc++
-				Linksym(ngotype(n))
 				continue
 			}
 			fallthrough

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

@@ -22,7 +22,7 @@ func TestSizeof(t *testing.T) {
 		_32bit uintptr     // size on 32bit platforms
 		_64bit uintptr     // size on 64bit platforms
 	}{
-		{Func{}, 108, 192}, // TODO(mdempsky): Change back to 96, 168 in followup CL.
+		{Func{}, 96, 168},
 		{Name{}, 52, 80},
 		{Node{}, 92, 144},
 		{Sym{}, 60, 112},

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

@@ -276,7 +276,6 @@ type Func struct {
 	Exit       Nodes
 	Cvars      Nodes   // closure params
 	Dcl        []*Node // autodcl for this func/closure
-	UnsortedDcls []*Node // autodcl for this func/closure
 	Inldcl     Nodes   // copy of dcl for use in inlining
 	Closgen    int
 	Outerfunc  *Node // outer function (for closure)