Add JSNull, JSBool and JSFunction, and move toString into the new interceptor scheme.

sdk/lib/_internal/compiler/implementation/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 Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
@@ skipping 425 matching lines @@
       if (cls == builder.backend.jsArrayClass) {
         type = HType.READABLE_ARRAY;
       } else if (cls == builder.backend.jsStringClass) {
         type = HType.STRING;
       } else if (cls == builder.backend.jsNumberClass) {
         type = HType.NUMBER;
       } else if (cls == builder.backend.jsIntClass) {
         type = HType.INTEGER;
       } else if (cls == builder.backend.jsDoubleClass) {
         type = HType.DOUBLE;
+      } else if (cls == builder.backend.jsNullClass) {
+        type = HType.NULL;
+      } else if (cls == builder.backend.jsBoolClass) {
+        type = HType.BOOLEAN;
       }
       value.guaranteedType = type;
     }
   }
 
   bool hasValueForDirectLocal(Element element) {
     assert(element != null);
     assert(isAccessedDirectly(element));
     return directLocals[element] != null;
   }
@@ skipping 4482 matching lines @@
           new HSubGraphBlockInformation(elseBranch.graph));
 
     HBasicBlock conditionStartBlock = conditionBranch.block;
     conditionStartBlock.setBlockFlow(info, joinBlock);
     SubGraph conditionGraph = conditionBranch.graph;
     HIf branch = conditionGraph.end.last;
     assert(branch is HIf);
     branch.blockInformation = conditionStartBlock.blockFlow;
   }
 }