test: add gcc65755.go for http://gcc.gnu.org/PR65755

Change-Id: Ic35dff4c9a7fc6716ef9d5553a7b1769bed9be01
Reviewed-on: https://go-review.googlesource.com/8892Reviewed-by: Minux Ma <minux@golang.org>

test/fixedbugs/gcc65755.go

+// run
+
+// 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.
+
+// PR65755: Incorrect type descriptor for type defined within method.
+
+package main
+
+import "reflect"
+
+type S1 struct{}
+
+func (S1) Fix() string {
+	type s struct {
+		f int
+	}
+	return reflect.TypeOf(s{}).Field(0).Name
+}
+
+type S2 struct{}
+
+func (S2) Fix() string {
+	type s struct {
+		g bool
+	}
+	return reflect.TypeOf(s{}).Field(0).Name
+}
+
+func main() {
+	f1 := S1{}.Fix()
+	f2 := S2{}.Fix()
+	if f1 != "f" || f2 != "g" {
+		panic(f1 + f2)
+	}
+}