[ic] Fixed receiver_map register trashing in KeyedStoreIC megamorphic.

src/arm/macro-assembler-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 2073 matching lines @@
 
 
 void MacroAssembler::StoreNumberToDoubleElements(
                                       Register value_reg,
                                       Register key_reg,
                                       Register elements_reg,
                                       Register scratch1,
                                       LowDwVfpRegister double_scratch,
                                       Label* fail,
                                       int elements_offset) {
+  DCHECK(!AreAliased(value_reg, key_reg, elements_reg, scratch1));
   Label smi_value, store;
 
   // Handle smi values specially.
   JumpIfSmi(value_reg, &smi_value);
 
   // Ensure that the object is a heap number
   CheckMap(value_reg,
            scratch1,
            isolate()->factory()->heap_number_map(),
            fail,
@@ skipping 1578 matching lines @@
     }
   }
   if (mag.shift > 0) mov(result, Operand(result, ASR, mag.shift));
   add(result, result, Operand(dividend, LSR, 31));
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM