In my final round of refactoring, I accidentally broke my string...

src/stub-cache-ia32.cc

 // 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 167 matching lines @@
   __ j(not_zero, non_string_object, not_taken);
 }
 
 
 void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm,
                                             Register receiver,
                                             Register scratch,
                                             Label* miss) {
   Label load_length, check_wrapper;
 
-  // Check if the object is a string.
+  // Check if the object is a string leaving the instance type in the
+  // scratch register.
   GenerateStringCheck(masm, receiver, scratch, miss, &check_wrapper);
 
   // Load length directly from the string.
   __ bind(&load_length);
   __ and_(scratch, kStringSizeMask);
   __ mov(eax, FieldOperand(receiver, String::kLengthOffset));
   // ecx is also the receiver.
   __ lea(ecx, Operand(scratch, String::kLongLengthShift));
   __ shr(eax);  // ecx is implicit shift register.
   __ shl(eax, kSmiTagSize);
   __ ret(0);
 
   // Check if the object is a JSValue wrapper.
   __ bind(&check_wrapper);
-  __ cmp(receiver, JS_VALUE_TYPE);
+  __ cmp(scratch, JS_VALUE_TYPE);
   __ j(not_equal, miss, not_taken);
 
   // Check if the wrapped value is a string and load the length
   // directly if it is.
   __ mov(receiver, FieldOperand(receiver, JSValue::kValueOffset));
   GenerateStringCheck(masm, receiver, scratch, miss, miss);
   __ jmp(&load_length);
 }
 
 
@@ skipping 987 matching lines @@
   GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC);
 
   // Return the generated code.
   return GetCode(CALLBACKS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal