test: add new Go tests from source repo

gcc/testsuite/go.test/test/fixedbugs/issue27836.dir/Äfoo.go

@@ -0,0 +1,13 @@
+package Äfoo
+
+var ÄbarV int = 101
+
+func Äbar(x int) int {
+	defer func() { ÄbarV += 3 }()
+	return Äblix(x)
+}
+
+func Äblix(x int) int {
+	defer func() { ÄbarV += 9 }()
+	return ÄbarV + x
+}

gcc/testsuite/go.test/test/fixedbugs/issue27836.dir/Ämain.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+
+	"./Äfoo"
+	Äblix "./Äfoo"
+)
+
+func main() {
+	fmt.Printf("Äfoo.Äbar(33) returns %v\n", Äfoo.Äbar(33))
+	fmt.Printf("Äblix.Äbar(33) returns %v\n", Äblix.Äbar(33))
+}

gcc/testsuite/go.test/test/fixedbugs/issue27836.go

@@ -0,0 +1,7 @@
+// compiledir
+
+// Copyright 2018 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 ignored