Use weak cells in CheckPropertyCell.

src/ic/arm64/handler-compiler-arm64.cc

 // Copyright 2014 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 "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ic/call-optimization.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 93 matching lines @@
 
 
 // Generate code to check that a global property cell is empty. Create
 // the property cell at compilation time if no cell exists for the
 // property.
 void PropertyHandlerCompiler::GenerateCheckPropertyCell(
     MacroAssembler* masm, Handle<JSGlobalObject> global, Handle<Name> name,
     Register scratch, Label* miss) {
   Handle<Cell> cell = JSGlobalObject::EnsurePropertyCell(global, name);
   DCHECK(cell->value()->IsTheHole());
-  __ Mov(scratch, Operand(cell));
+  Handle<WeakCell> weak_cell = masm->isolate()->factory()->NewWeakCell(cell);
+  __ LoadWeakValue(scratch, weak_cell, miss);
   __ Ldr(scratch, FieldMemOperand(scratch, Cell::kValueOffset));
   __ JumpIfNotRoot(scratch, Heap::kTheHoleValueRootIndex, miss);
 }
 
 
 static void PushInterceptorArguments(MacroAssembler* masm, Register receiver,
                                      Register holder, Register name,
                                      Handle<JSObject> holder_obj) {
   STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsNameIndex == 0);
   STATIC_ASSERT(NamedLoadHandlerCompiler::kInterceptorArgsInfoIndex == 1);
@@ skipping 640 matching lines @@
   // Return the generated code.
   return GetCode(kind(), Code::FAST, name);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32