Use weak cells to embed maps in store handler.

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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 5110 matching lines @@
   if (mask < (1 << kBitsPerByte)) {
     testb(Operand(scratch, MemoryChunk::kFlagsOffset),
           Immediate(static_cast<uint8_t>(mask)));
   } else {
     testl(Operand(scratch, MemoryChunk::kFlagsOffset), Immediate(mask));
   }
   j(cc, condition_met, condition_met_distance);
 }
 
 
-void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
-                                        Register scratch,
-                                        Label* if_deprecated) {
-  if (map->CanBeDeprecated()) {
-    Move(scratch, map);
-    movl(scratch, FieldOperand(scratch, Map::kBitField3Offset));
-    andl(scratch, Immediate(Map::Deprecated::kMask));
-    j(not_zero, if_deprecated);
-  }
-}
-
-
 void MacroAssembler::JumpIfBlack(Register object,
                                  Register bitmap_scratch,
                                  Register mask_scratch,
                                  Label* on_black,
                                  Label::Distance on_black_distance) {
   DCHECK(!AreAliased(object, bitmap_scratch, mask_scratch, rcx));
   GetMarkBits(object, bitmap_scratch, mask_scratch);
 
   DCHECK(strcmp(Marking::kBlackBitPattern, "10") == 0);
   // The mask_scratch register contains a 1 at the position of the first bit
@@ skipping 256 matching lines @@
   if (mag.shift > 0) sarl(rdx, Immediate(mag.shift));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64