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

src/arm/ic-arm.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 97 matching lines @@
   for (int i = 0; i < kProbes; i++) {
     // Compute the masked index: (hash + i + i * i) & mask.
     __ ldr(t1, FieldMemOperand(r2, String::kHashFieldOffset));
     if (i > 0) {
       // Add the probe offset (i + i * i) left shifted to avoid right shifting
       // the hash in a separate instruction. The value hash + i + i * i is right
       // shifted in the following and instruction.
       ASSERT(StringDictionary::GetProbeOffset(i) <
              1 << (32 - String::kHashFieldOffset));
       __ add(t1, t1, Operand(
-          StringDictionary::GetProbeOffset(i) << String::kHashFieldOffset));
+          StringDictionary::GetProbeOffset(i) << String::kHashShift));
     }
     __ and_(t1, r3, Operand(t1, LSR, String::kHashShift));
 
     // Scale the index by multiplying by the element size.
     ASSERT(StringDictionary::kEntrySize == 3);
     __ add(t1, t1, Operand(t1, LSL, 1));  // t1 = t1 * 3
 
     // Check if the key is identical to the name.
     __ add(t1, t0, Operand(t1, LSL, 2));
     __ ldr(ip, FieldMemOperand(t1, kElementsStartOffset));
@@ skipping 705 matching lines @@
 
   // Perform tail call to the entry.
   __ TailCallRuntime(f, 3, 1);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal