Fix boolean conversion bug in dart2js + update JSRegExp accordingly.

pkg/compiler/lib/src/ssa/builder.dart

 // Copyright (c) 2012, 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.
 
 part of ssa;
 
 class SsaFunctionCompiler implements FunctionCompiler {
   SsaCodeGeneratorTask generator;
   SsaBuilderTask builder;
   SsaOptimizerTask optimizer;
@@ skipping 475 matching lines @@
       if (directLocals[local] == null) {
         if (local is TypeVariableElement) {
           builder.compiler.internalError(builder.compiler.currentElement,
               "Runtime type information not available for $local.");
         } else {
           builder.compiler.internalError(local,
               "Cannot find value $local.");
         }
       }
       HInstruction value = directLocals[local];
-      if (false && sourceInformation != null) {
-        // TODO(johnniwinther): Enable this again when boolean conversions of
-        // boolean type conversions are handled correctly.
+      if (sourceInformation != null) {
         value = new HRef(value, sourceInformation);
         builder.add(value);
       }
       return value;
     } else if (isStoredInClosureField(local)) {
       ClosureFieldElement redirect = redirectionMapping[local];
       HInstruction receiver = readLocal(closureData.closureElement);
       TypeMask type = local is BoxLocal
           ? builder.backend.nonNullType
           : builder.getTypeOfCapturedVariable(redirect);
@@ skipping 8367 matching lines @@
     if (unaliased is TypedefType) throw 'unable to unalias $type';
     unaliased.accept(this, builder);
   }
 
   void visitDynamicType(DynamicType type, SsaBuilder builder) {
     JavaScriptBackend backend = builder.compiler.backend;
     ClassElement cls = backend.findHelper('DynamicRuntimeType');
     builder.push(new HDynamicType(type, new TypeMask.exact(cls, classWorld)));
   }
 }