Revert of Use weak cells in map checks in polymorphic ICs.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index 38884aa65bc2924f50a8f076d9d6553e9104d72d..d8878a83ee3890a5fa181c0c4124b2e195a6912c 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -2852,21 +2852,6 @@
 }
 
 
-void MacroAssembler::CmpWeakValue(Register value, Handle<WeakCell> cell,
-                                  Register scratch) {
-  Move(scratch, cell, RelocInfo::EMBEDDED_OBJECT);
-  cmpp(value, FieldOperand(scratch, WeakCell::kValueOffset));
-}
-
-
-void MacroAssembler::LoadWeakValue(Register value, Handle<WeakCell> cell,
-                                   Label* miss) {
-  Move(value, cell, RelocInfo::EMBEDDED_OBJECT);
-  movp(value, FieldOperand(value, WeakCell::kValueOffset));
-  JumpIfSmi(value, miss);
-}
-
-
 void MacroAssembler::Drop(int stack_elements) {
   if (stack_elements > 0) {
     addp(rsp, Immediate(stack_elements * kPointerSize));