Change the handling of catch blocks to use context extension objects...

src/runtime.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 235 matching lines @@
   F(DebugConstructedBy, 2) \
   F(GetPrototype, 1) \
   F(SystemBreak, 0) \
   \
   /* Literals */ \
   F(MaterializeRegExpLiteral, 4)\
   F(CreateArrayLiteral, 2) \
   F(CreateObjectLiteralBoilerplate, 3) \
   F(CloneObjectLiteralBoilerplate, 1) \
   \
+  /* Catch context extension objects */ \
+  F(CreateCatchExtensionObject, 2) \
+  \
   /* Statements */ \
   F(NewClosure, 2) \
   F(NewObject, 1) \
   F(Throw, 1) \
   F(ReThrow, 1) \
   F(ThrowReferenceError, 1) \
   F(StackGuard, 1) \
   \
   /* Contexts */ \
   F(NewContext, 1) \
@@ skipping 97 matching lines @@
   static Object* GetObjectProperty(Handle<Object> object, Handle<Object> key);
 
   // Helper functions used stubs.
   static void PerformGC(Object* result);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_