cmd/compile: remove tempname usages

CL 59610 merged tempname to tempAt, but some of comments and error
message still refer to tempname. So changing to tempAt instead.

Change-Id: I032f3bedc135d17124b0daaf22c97d0d5ada0a6f
Reviewed-on: https://go-review.googlesource.com/c/go/+/193817
Run-TryBot: Cuong Manh Le <cuong.manhle.vn@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>

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

@@ -52,14 +52,14 @@ func autotmpname(n int) string {
 // make a new Node off the books
 func tempAt(pos src.XPos, curfn *Node, t *types.Type) *Node {
 	if curfn == nil {
-		Fatalf("no curfn for tempname")
+		Fatalf("no curfn for tempAt")
 	}
 	if curfn.Func.Closure != nil && curfn.Op == OCLOSURE {
-		Dump("tempname", curfn)
-		Fatalf("adding tempname to wrong closure function")
+		Dump("tempAt", curfn)
+		Fatalf("adding tempAt to wrong closure function")
 	}
 	if t == nil {
-		Fatalf("tempname called with nil type")
+		Fatalf("tempAt called with nil type")
 	}
 
 	s := &types.Sym{

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

@@ -1753,7 +1753,7 @@ func walkCall(n *Node, init *Nodes) {
 			t = params.Field(i).Type
 		}
 		if instrumenting || fncall(arg, t) {
-			// make assignment of fncall to tempname
+			// make assignment of fncall to tempAt
 			tmp := temp(t)
 			a := nod(OAS, tmp, arg)
 			a = convas(a, init)