test: add test case that caused a gofrontend crash

For #52841

Change-Id: If4723a70fba0dbedb5d1e70dab58f0b4612bf8b9
Reviewed-on: https://go-review.googlesource.com/c/go/+/405759
Auto-Submit: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>

test/fixedbugs/issue52841.go

@@ -0,0 +1,30 @@
+// 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.
+
+// Issue 52841: gofrontend crashed writing export data
+
+package p
+
+func F() {
+	x := ([17][1]interface {
+		Method9()
+		Method10()
+	}{
+		func() (V47 [1]interface {
+			Method9()
+			Method10()
+		}) {
+			return
+		}(),
+		func(V48 string) (V49 [1]interface {
+			Method9()
+			Method10()
+		}) {
+			return
+		}("440"),
+	})
+	_ = x
+}