dart2js cps: Introduce some built-in operators in type propagation.

pkg/compiler/lib/src/cps_ir/cps_ir_nodes_sexpr.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library dart2js.ir_nodes_sexpr;
 
 import '../constants/values.dart';
 import '../util/util.dart';
 import 'cps_ir_nodes.dart';
 
@@ skipping 306 matching lines @@
 
   String visitReifyRuntimeType(ReifyRuntimeType node) {
     return '(ReifyRuntimeType ${access(node.value)})';
   }
 
   String visitReadTypeVariable(ReadTypeVariable node) {
     return '(ReadTypeVariable ${access(node.target)}.${node.variable})';
   }
 
   String visitTypeExpression(TypeExpression node) {
-    String args = node.arguments.map(access).join(', ');
-    return '(TypeExpression ${node.dartType.toString()} $args)';
+    String args = node.arguments.map(access).join(' ');
+    return '(TypeExpression ${node.dartType} ($args))';
   }
 
   String visitNonTailThrow(NonTailThrow node) {
     String value = access(node.value);
     return '(NonTailThrow $value)';
   }
 
   String visitCreateInvocationMirror(CreateInvocationMirror node) {
     String selector = node.selector.name;
-    String args = node.arguments.map(access).join(', ');
-    return '(CreateInvocationMirror $selector $args)';
+    String args = node.arguments.map(access).join(' ');
+    return '(CreateInvocationMirror $selector ($args))';
+  }
+
+  String visitApplyBuiltinOperator(ApplyBuiltinOperator node) {
+    String operator = node.operator.toString();
+    String args = node.arguments.map(access).join(' ');
+    return '(ApplyBuiltinOperator $operator ($args))';
   }
 }
 
 class ConstantStringifier extends ConstantValueVisitor<String, Null> {
   // Some of these methods are unimplemented because we haven't had a need
   // to print such constants.  When printing is implemented, the corresponding
   // parsing support should be added to SExpressionUnstringifier.parseConstant
   // in the dart2js tests (currently in the file
   // tests/compiler/dart2js/backend_dart/sexpr_unstringifier.dart).
 
@@ skipping 95 matching lines @@
   void setReturnContinuation(Continuation node) {
     assert(!_names.containsKey(node) || _names[node] == 'return');
     _names[node] = 'return';
   }
 
   String getName(Node node) {
     if (!_names.containsKey(node)) return 'MISSING_NAME';
     return _names[node];
   }
 }