Elide hole checks on KeyedLoads of holey double arrays.

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 82 matching lines @@
   }
   PopulateDeoptimizationData(code);
   for (int i = 0 ; i < prototype_maps_.length(); i++) {
     prototype_maps_.at(i)->AddDependentCode(
         DependentCode::kPrototypeCheckGroup, code);
   }
   for (int i = 0 ; i < transition_maps_.length(); i++) {
     transition_maps_.at(i)->AddDependentCode(
         DependentCode::kTransitionGroup, code);
   }
+  if (graph()->depends_on_empty_array_proto_elements()) {
+    isolate()->initial_object_prototype()->map()->AddDependentCode(
+        DependentCode::kElementsCantBeAddedGroup, code);
+    isolate()->initial_array_prototype()->map()->AddDependentCode(
+        DependentCode::kElementsCantBeAddedGroup, code);
+  }
 }
 
 
 void LChunkBuilder::Abort(const char* reason) {
   info()->set_bailout_reason(reason);
   status_ = ABORTED;
 }
 
 
 void LCodeGen::Comment(const char* format, ...) {
@@ skipping 5484 matching lines @@
                                FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64