Reland [heap] Avoid the use of cells to point from code to new-space objects.

src/x64/macro-assembler-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 2948 matching lines @@
     Push(Smi::cast(*source));
   } else {
     MoveHeapObject(kScratchRegister, source);
     Push(kScratchRegister);
   }
 }
 
 
 void MacroAssembler::MoveHeapObject(Register result,
                                     Handle<Object> object) {
-  AllowDeferredHandleDereference using_raw_address;
   DCHECK(object->IsHeapObject());
-  if (isolate()->heap()->InNewSpace(*object)) {
-    Handle<Cell> cell = isolate()->factory()->NewCell(object);
-    Move(result, cell, RelocInfo::CELL);
-    movp(result, Operand(result, 0));
-  } else {
-    Move(result, object, RelocInfo::EMBEDDED_OBJECT);
-  }
+  Move(result, object, RelocInfo::EMBEDDED_OBJECT);
 }
 
 
 void MacroAssembler::LoadGlobalCell(Register dst, Handle<Cell> cell) {
   if (dst.is(rax)) {
     AllowDeferredHandleDereference embedding_raw_address;
     load_rax(cell.location(), RelocInfo::CELL);
   } else {
     Move(dst, cell, RelocInfo::CELL);
     movp(dst, Operand(dst, 0));
@@ skipping 2734 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64