Change the representation of catch contexts.

src/full-codegen.cc

 // Copyright 2011 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 1089 matching lines @@
   // that scope again afterwards.
 
   Label try_handler_setup, catch_entry, done;
   __ Call(&try_handler_setup);
   // Try handler code, exception in result register.
 
   // Extend the context before executing the catch block.
   { Comment cmnt(masm_, "[ Extend catch context");
     __ Push(stmt->name());
     __ push(result_register());
-    __ CallRuntime(Runtime::kCreateCatchExtensionObject, 2);
-    __ push(result_register());
-    __ CallRuntime(Runtime::kPushCatchContext, 1);
+    __ CallRuntime(Runtime::kPushCatchContext, 2);
     StoreToFrameField(StandardFrameConstants::kContextOffset,
                       context_register());
   }
 
   Visit(stmt->catch_block());
   __ jmp(&done);
 
   // Try block code. Sets up the exception handler chain.
   __ bind(&try_handler_setup);
   {
@@ skipping 166 matching lines @@
   __ Drop(stack_depth);
   __ PopTryHandler();
   return 0;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal