undo CL 77050045 / 073d79675aae

Breaks all builds.

««« original CL description
cmd/gc: Add tests for self-referential array types.

LGTM=gri, iant
R=gri, iant
CC=golang-codereviews
https://golang.org/cl/77050045
»»»

TBR=cmang
R=cmang
CC=golang-codereviews
https://golang.org/cl/77210043

test/fixedbugs/issue7525.go

-// errorcheck
-
-// Copyright 2014 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.
-
-// Issue 7525: self-referential array types.
-
-package main
-
-import "unsafe"
-
-var x struct {
-	a [unsafe.Sizeof(x.a)]int // ERROR "array bound|invalid array"
-	b [unsafe.Offsetof(x.b)]int // ERROR "array bound|invalid array"
-	c [unsafe.Alignof(x.c)]int // ERROR "array bound|invalid array"
-	d [len(x.d)]int // ERROR "array bound|invalid array"
-	e [cap(x.e)]int // ERROR "array bound|invalid array"
-}