test: add some tests of valid code that failed with gccgo

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5971044

test/blank.go

@@ -113,7 +113,7 @@ type I interface {
 
 type TI struct{}
 
-func (TI) M(x int, y int) {
+func (_ TI) M(x int, y int) {
 	if x != y {
 		println("invalid M call:", x, y)
 		panic("bad M")

test/fixedbugs/bug430.go

+// compile
+
+// Copyright 2012 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.
+
+// gccgo crashed compiling this.
+
+package main
+
+type S struct {
+	f [2][]int
+}
+
+func F() (r [2][]int) {
+	return
+}
+
+func main() {
+	var a []S
+	a[0].f = F()
+}

test/fixedbugs/bug431.go

+// compile
+
+// Copyright 2012 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.
+
+// gccgo gave an invalid error ("floating point constant truncated to
+// integer") compiling this.
+
+package p
+
+const C = 1<<63 - 1
+
+func F(i int64) int64 {
+	return i
+}
+
+var V = F(int64(C) / 1e6)

test/fixedbugs/bug432.go

+// compile
+
+// Copyright 2012 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.
+
+// gccgo crashed compiling this.
+
+package p
+
+var v struct{ I }
+
+type I interface{}

test/fixedbugs/bug433.go

+// run
+
+// Copyright 2012 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.
+
+// Test that initializing struct fields out of order still runs
+// functions in the right order.  This failed with gccgo.
+
+package main
+
+type S struct {
+	i1, i2, i3 int
+}
+
+var G int
+
+func v(i int) int {
+	if i != G {
+		panic(i)
+	}
+	G = i + 1
+	return G
+}
+
+func F() S {
+	return S{
+		i1: v(0),
+		i3: v(1),
+		i2: v(2),
+	}
+}
+
+func main() {
+	s := F()
+	if s != (S{1, 3, 2}) {
+		panic(s)
+	}
+}