- map composites should be of correct map type (instead of pointer type)

R=r
OCL=15180
CL=15180

test/bugs/bug098.go

+// $G $D/$F.go || echo BUG should compile
+
+// Copyright 2009 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
+
+type A []int;
+type M map[int] int;
+
+func main() {
+	var a *A = &A{0};
+	var m *M = &M{0 : 0};  // should be legal to use & here for consistency with other composite constructors (prev. line)
+}
+
+/*
+uetli:~/Source/go1/test/bugs gri$ 6g bug098.go && 6l bug098.6 && 6.out
+bug098.go:10: illegal types for operand: AS
+	(*MAP[<int32>INT32]<int32>INT32)
+	(**MAP[<int32>INT32]<int32>INT32)
+*/

test/golden.out

@@ -165,6 +165,12 @@ panic on line 344 PC=0x13c2
 BUG wrong result
 Trace/BPT trap          ./$A.out
 
+=========== bugs/bug098.go
+bugs/bug098.go:10: illegal types for operand: AS
+	(*MAP[<int32>INT32]<int32>INT32)
+	(**MAP[<int32>INT32]<int32>INT32)
+BUG should compile
+
 =========== fixedbugs/bug015.go
 fixedbugs/bug015.go:7: overflow converting constant to <int64>INT64