Add lithium support for %_GetCachedArrayIndex for IA32 and X64

src/arm/lithium-codegen-arm.cc

 // Copyright 2011 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 1693 matching lines @@
   __ b(eq, false_label);
 
   __ CompareObjectType(input, scratch, scratch, TestType(instr->hydrogen()));
   EmitBranch(true_block, false_block, BranchCondition(instr->hydrogen()));
 }
 
 
 void LCodeGen::DoGetCachedArrayIndex(LGetCachedArrayIndex* instr) {
   Register input = ToRegister(instr->InputAt(0));
   Register result = ToRegister(instr->result());
-  Register scratch = scratch0();
 
-  __ ldr(scratch, FieldMemOperand(input, String::kHashFieldOffset));
-  __ IndexFromHash(scratch, result);
+  if (FLAG_debug_code) {
+    __ AbortIfNotString(input);
+  }
+
+  __ ldr(result, FieldMemOperand(input, String::kHashFieldOffset));
+  __ IndexFromHash(result, result);
 }
 
 
 void LCodeGen::DoHasCachedArrayIndex(LHasCachedArrayIndex* instr) {
   Register input = ToRegister(instr->InputAt(0));
   Register result = ToRegister(instr->result());
   Register scratch = scratch0();
 
   ASSERT(instr->hydrogen()->value()->representation().IsTagged());
   __ ldr(scratch,
@@ skipping 2119 matching lines @@
   ASSERT(!environment->HasBeenRegistered());
   RegisterEnvironmentForDeoptimization(environment);
   ASSERT(osr_pc_offset_ == -1);
   osr_pc_offset_ = masm()->pc_offset();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal