Try to preallocate the scratch registers used for inlined keyed loads...

src/codegen.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 104 matching lines @@
   }
 
   MacroAssembler* masm() const { return masm_; }
   CodeGenerator* generator() const { return generator_; }
 
   // Set the virtual frame for entry to the deferred code as a
   // snapshot of the code generator's current frame (plus additional
   // results).  This is optional, but should be done before branching
   // or jumping to the deferred code.
   inline void SetEntryFrame(Result* arg);
+  inline void SetEntryFrame(Result* arg0, Result* arg1);
 
   JumpTarget* enter() { return &enter_; }
 
   void BindExit() { exit_.Bind(0); }
   void BindExit(Result* result) { exit_.Bind(result, 1); }
   void BindExit(Result* result0, Result* result1) {
     exit_.Bind(result0, result1, 2);
   }
   void BindExit(Result* result0, Result* result1, Result* result2) {
     exit_.Bind(result0, result1, result2, 3);
@@ skipping 186 matching lines @@
     PrintF("ArgumentsAccessStub (type %d)\n", type_);
   }
 #endif
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_