add two more tests

SVN=123143

test/bugs/bug049.go

+// errchk $G $D/$F.go
+
+// 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
+
+func atom(s string) {
+	if s == nil {
+		return;
+	}
+}
+
+/*
+bug047.go:4: fatal error: stringpool: not string
+*/

test/bugs/bug050.go

+// errchk $G $D/$F.go
+
+// 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.
+
+func main() {
+}

test/golden.out

@@ -242,6 +242,15 @@ bugs/bug048.go:7: illegal types for operand: CONV
 bugs/bug048.go:8: syntax error
 BUG: known to fail incorrectly
 
+=========== bugs/bug049.go
+bugs/bug049.go:6: fatal error: stringpool: not string
+BUG: fatal error
+
+=========== bugs/bug050.go
+bugs/bug050.go:3: package statement must be first
+sys.6:1 bugs/bug050.go:2: syntax error
+BUG: segfault
+
 =========== fixedbugs/bug000.go
 
 =========== fixedbugs/bug001.go