test: add test that caused gofrontend crash

For #52871

Change-Id: Id6102222a8b1ec8a84b716425bed0e349c65dbc4
Reviewed-on: https://go-review.googlesource.com/c/go/+/414336
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>

test/fixedbugs/issue52871.go

@@ -0,0 +1,17 @@
+// compile
+
+// Copyright 2022 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.
+
+// gofrontend crashed compiling this code.
+
+package p
+
+type S struct {}
+
+func (s *S) test(_ string) {}
+
+var T = [1]func(*S, string) {
+	(*S).test,
+}