Fix megamorphic load regression on ARM caused by the string...

src/arm/stub-cache-arm.cc

 // Copyright 2006-2009 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 87 matching lines @@
 
   // Make sure that there are no register conflicts.
   ASSERT(!scratch.is(receiver));
   ASSERT(!scratch.is(name));
 
   // Check that the receiver isn't a smi.
   __ tst(receiver, Operand(kSmiTagMask));
   __ b(eq, &miss);
 
   // Get the map of the receiver and compute the hash.
-  __ ldr(scratch, FieldMemOperand(name, String::kLengthOffset));
+  __ ldr(scratch, FieldMemOperand(name, String::kHashFieldOffset));
   __ ldr(ip, FieldMemOperand(receiver, HeapObject::kMapOffset));
   __ add(scratch, scratch, Operand(ip));
   __ eor(scratch, scratch, Operand(flags));
   __ and_(scratch,
           scratch,
           Operand((kPrimaryTableSize - 1) << kHeapObjectTagSize));
 
   // Probe the primary table.
   ProbeTable(masm, flags, kPrimary, name, scratch);
 
@@ skipping 1359 matching lines @@
   __ Jump(generic_construct_stub, RelocInfo::CODE_TARGET);
 
   // Return the generated code.
   return GetCode();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal