Remove special handling of fields in combination with elements transitions in Crankshaft.

src/x64/lithium-codegen-x64.cc

 // Copyright 2013 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 2762 matching lines @@
 }
 
 
 // Check for cases where EmitLoadFieldOrConstantFunction needs to walk the
 // prototype chain, which causes unbounded code generation.
 static bool CompactEmit(SmallMapList* list,
                         Handle<String> name,
                         int i,
                         Isolate* isolate) {
   Handle<Map> map = list->at(i);
-  // If the map has ElementsKind transitions, we will generate map checks
-  // for each kind in __ CompareMap(..., ALLOW_ELEMENTS_TRANSITION_MAPS).
-  if (map->HasElementsTransition()) return false;
   LookupResult lookup(isolate);
   map->LookupDescriptor(NULL, *name, &lookup);
   return lookup.IsField() || lookup.IsConstant();
 }
 
 
 void LCodeGen::DoLoadNamedFieldPolymorphic(LLoadNamedFieldPolymorphic* instr) {
   Register object = ToRegister(instr->object());
   Register result = ToRegister(instr->result());
 
@@ skipping 2778 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64