Add support for javascript incompatibility warnings.

runtime/vm/intermediate_language.h

 // 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.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 4043 matching lines @@
  public:
   StringInterpolateInstr(Value* value, intptr_t token_pos)
       : token_pos_(token_pos), function_(Function::Handle()) {
     SetInputAt(0, value);
   }
 
   Value* value() const { return inputs_[0]; }
   virtual intptr_t token_pos() const { return token_pos_; }
 
   virtual CompileType ComputeType() const;
-  // Issues a static call to Dart code whihc calls toString on objects.
+  // Issues a static call to Dart code which calls toString on objects.
   virtual EffectSet Effects() const { return EffectSet::All(); }
   virtual bool CanDeoptimize() const { return true; }
   virtual bool MayThrow() const { return true; }
 
   const Function& CallFunction() const;
 
   virtual Definition* Canonicalize(FlowGraph* flow_graph);
 
   DECLARE_INSTRUCTION(StringInterpolate)
 
@@ skipping 3882 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_