test: add new test case for gccgo compiler bug

Test case that causes incorrect compiler error from gccgo.

Updates #32922

Change-Id: I59432a8e8770cf03eda293f6d110c081c18fa88b
Reviewed-on: https://go-review.googlesource.com/c/go/+/184918
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>

test/fixedbugs/issue32922.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
+
+func A() int {
+	return p("count")
+}
+
+func p(which string, args ...string) int {
+	switch which {
+	case "count", "something":
+		return 1
+	default:
+		return 2
+	}
+}

test/fixedbugs/issue32922.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 B() int {
+	return 99 + a.A()
+}

test/fixedbugs/issue32922.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
+// error in gccgo (problem with the way inlinable call expressions are
+// imported). See issue 32922 for details.
+
+package ignored