Ensure that all descriptors have a valid enumeration index, and replace NextEnumIndex with LastAdde…

src/arm/full-codegen-arm.cc

 // Copyright 2012 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 1124 matching lines @@
   Label fixed_array;
   __ mov(r2, r0);
   __ ldr(r1, FieldMemOperand(r2, HeapObject::kMapOffset));
   __ LoadRoot(ip, Heap::kMetaMapRootIndex);
   __ cmp(r1, ip);
   __ b(ne, &fixed_array);
 
   // We got a map in register r0. Get the enumeration cache from it.
   __ bind(&use_cache);
   __ LoadInstanceDescriptors(r0, r1, r2);
-  __ ldr(r1, FieldMemOperand(r1, DescriptorArray::kEnumerationIndexOffset));
+  __ ldr(r1, FieldMemOperand(r1, DescriptorArray::kLastAddedOffset));
   __ ldr(r2, FieldMemOperand(r1, DescriptorArray::kEnumCacheBridgeCacheOffset));
 
   // Set up the four remaining stack slots.
   __ push(r0);  // Map.
   __ ldr(r1, FieldMemOperand(r2, FixedArray::kLengthOffset));
   __ mov(r0, Operand(Smi::FromInt(0)));
   // Push enumeration cache, enumeration cache length (as smi) and zero.
   __ Push(r2, r1, r0);
   __ jmp(&loop);
 
@@ skipping 3421 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM