Fix problem with arguments object ICs not checking for dictionary mode elements.

src/arm/ic-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 934 matching lines @@
                                                   Register parameter_map,
                                                   Register scratch,
                                                   Label* slow_case) {
   // Element is in arguments backing store, which is referenced by the
   // second element of the parameter_map. The parameter_map register
   // must be loaded with the parameter map of the arguments object and is
   // overwritten.
   const int kBackingStoreOffset = FixedArray::kHeaderSize + kPointerSize;
   Register backing_store = parameter_map;
   __ ldr(backing_store, FieldMemOperand(parameter_map, kBackingStoreOffset));
+  Handle<Map> fixed_array_map(masm->isolate()->heap()->fixed_array_map());
+  __ CheckMap(backing_store, scratch, fixed_array_map, slow_case,
+              DONT_DO_SMI_CHECK);
   __ ldr(scratch, FieldMemOperand(backing_store, FixedArray::kLengthOffset));
   __ cmp(key, Operand(scratch));
   __ b(cs, slow_case);
   __ mov(scratch, Operand(kPointerSize >> 1));
   __ mul(scratch, key, scratch);
   __ add(scratch,
          scratch,
          Operand(FixedArray::kHeaderSize - kHeapObjectTag));
   return MemOperand(backing_store, scratch);
 }
@@ skipping 748 matching lines @@
     Register reg = Assembler::GetRn(instr_at_patch);
     patcher.masm()->tst(reg, Operand(kSmiTagMask));
     patcher.EmitCondition(eq);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM