cmd/compile: run escape analysis after method wrapper generation

Also modified test/run.go to ignore messages prefixed <autogenerated>
because those cannot be described with "// ERROR ...", and backed out
patch from issue #9537 because it is no longer necessary.  The reasons
described in the 9537 discussion for why escape analysis cannot run
late no longer hold, happily.

Fixes #11053.

Change-Id: Icb14eccdf2e8cde3d0f8fb8a216b765400a96385
Reviewed-on: https://go-review.googlesource.com/11088
Reviewed-by: Russ Cox <rsc@golang.org>
Run-TryBot: David Chase <drchase@google.com>

test/fixedbugs/issue11053.dir/p_test.go

@@ -0,0 +1,51 @@
+// Copyright 2015 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"p"
+)
+
+type I interface {
+	Add(out *P)
+}
+
+type P struct {
+	V *int32
+}
+
+type T struct{}
+
+var x int32 = 42
+
+func Int32x(i int32) *int32 {
+	return &i
+}
+
+func (T) Add(out *P) {
+	out.V = p.Int32(x) // inlined, p.i.2 moved to heap
+}
+
+var PP P
+var out *P = &PP
+
+func F(s I) interface{} {
+	s.Add(out) // not inlined.
+	return out
+}
+
+var s T
+
+func main() {
+	println("Starting")
+	fmt.Sprint(new(int32))
+	resp := F(s).(*P)
+	println("Before, *resp.V=", *resp.V) // Trashes *resp.V in process of printing.
+	println("After,  *resp.V=", *resp.V)
+	if got, want := *resp.V, int32(42); got != want {
+		fmt.Printf("FAIL, got %v, want %v", got, want)
+	}
+}