Add bool value types to type inference.

pkg/compiler/lib/src/inferrer/inferrer_visitor.dart

 // Copyright (c) 2013, 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 inferrer_visitor;
 
 import 'dart:collection' show
     IterableMixin;
 
 import '../compiler.dart' show
@@ skipping 40 matching lines @@
   T get listType;
   T get constListType;
   T get fixedListType;
   T get growableListType;
   T get mapType;
   T get constMapType;
   T get stringType;
   T get typeType;
 
   T stringLiteralType(DartString value);
+  T boolLiteralType(LiteralBool value);
 
   T nonNullSubtype(ClassElement type);
   T nonNullSubclass(ClassElement type);
   T nonNullExact(ClassElement type);
   T nonNullEmpty();
   bool isNull(T type);
   TypeMask newTypedSelector(T receiver, TypeMask mask);
 
   T allocateList(T type,
                  Node node,
@@ skipping 754 matching lines @@
     node.visitChildren(this);
     return types.stringType;
   }
 
   T visitStringJuxtaposition(StringJuxtaposition node) {
     node.visitChildren(this);
     return types.stringType;
   }
 
   T visitLiteralBool(LiteralBool node) {
-    return types.boolType;
+    return types.boolLiteralType(node);
   }
 
   T visitLiteralDouble(LiteralDouble node) {
     ConstantSystem constantSystem = compiler.backend.constantSystem;
     // The JavaScript backend may turn this literal into an integer at
     // runtime.
     return types.getConcreteTypeFor(
         computeTypeMask(compiler, constantSystem.createDouble(node.value)));
   }
 
@@ skipping 687 matching lines @@
     return type;
   }
 
   T visitCascade(Cascade node) {
     // Ignore the result of the cascade send and return the type of the cascade
     // receiver.
     visit(node.expression);
     return cascadeReceiverStack.removeLast();
   }
 }