Use regular map-checks to guard string-length loading.

src/ia32/code-stubs-ia32.cc

 // Copyright 2012 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 2738 matching lines @@
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
   Label miss;
 
   if (kind() == Code::KEYED_LOAD_IC) {
     __ cmp(ecx, Immediate(masm->isolate()->factory()->length_string()));
     __ j(not_equal, &miss);
   }
 
-  StubCompiler::GenerateLoadStringLength(masm, edx, eax, ebx, &miss,
-                                         support_wrapper_);
+  StubCompiler::GenerateLoadStringLength(masm, edx, eax, ebx, &miss);
   __ bind(&miss);
   StubCompiler::TailCallBuiltin(
       masm, BaseLoadStoreStubCompiler::MissBuiltin(kind()));
 }
 
 
 void StoreArrayLengthStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
   //  -- eax    : value
   //  -- ecx    : name
@@ skipping 4775 matching lines @@
   __ bind(&fast_elements_case);
   GenerateCase(masm, FAST_ELEMENTS);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32