test: add testcase for gccgo compile failure

Test case that caused a compiler crash in gofrontend, related to
exporting inlinable function bodies.

Updates #32778

Change-Id: Iacf1753825d5359da43e5e281189876d4c3dd3c9
Reviewed-on: https://go-review.googlesource.com/c/go/+/183851Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

test/fixedbugs/issue32778.dir/a.go

+// Copyright 2019 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 a
+
+import "strings"
+
+type Name string
+
+type FullName string
+
+func (n FullName) Name() Name {
+	if i := strings.LastIndexByte(string(n), '.'); i >= 0 {
+		return Name(n[i+1:])
+	}
+	return Name(n)
+}

test/fixedbugs/issue32778.dir/b.go

+// Copyright 2019 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 b
+
+import "./a"
+
+func Expo(fn a.FullName) a.Name {
+	return fn.Name()
+}

test/fixedbugs/issue32778.go

+// compiledir
+
+// Copyright 2019 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.
+
+// This directory contains a pair of packages that triggers a compiler
+// crash in gccgo (problem with tracking indirectly referenced
+// packages during exporting). See issue 32778 for details.
+
+package ignored