gc: tests omitted from the last bug fix

R=ken2
CC=golang-dev
https://golang.org/cl/748041

test/fixedbugs/bug262.go

+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2010 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 main
+
+import (
+	"os"
+	"strconv"
+)
+
+var trace string
+
+func f() string {
+	trace += "f"
+	return "abc"
+}
+
+func g() *os.Error {
+	trace += "g"
+	var x os.Error
+	return &x
+}
+
+func h() string {
+	trace += "h"
+	return "123"
+}
+
+func i() *int {
+	trace += "i"
+	var i int
+	return &i
+}
+
+
+func main() {
+	m := make(map[string]int)
+	m[f()], *g() = strconv.Atoi(h())
+	if m["abc"] != 123 || trace != "fgh" {
+		panic("BUG", m["abc"], trace)
+	}
+	mm := make(map[string]os.Error)
+	trace = ""
+	mm["abc"] = os.EINVAL
+	*i(), mm[f()] = strconv.Atoi(h())
+	if mm["abc"] != nil || trace != "ifh" {
+		panic("BUG1", mm["abc"], trace)
+	}
+}

test/fixedbugs/bug263.go

+// $G $D/$F.go && $L $F.$A && ./$A.out
+
+// Copyright 2010 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 main
+
+func main() {
+	data := make(map[int]string, 1)
+	data[0] = "hello, "
+	data[0] += "world!"
+	if data[0] != "hello, world!" {
+		panic("BUG: " + data[0])
+	}
+}