Use weak cells to embed maps in store handler.

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index 20133c14e3daa0784c16d7d3af62d11d12705974..d359528e1ae735744a964ea8e7339149e6505372 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -4650,17 +4650,6 @@ void MacroAssembler::HasColor(Register object,
 }
 
 
-void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
-                                        Register scratch,
-                                        Label* if_deprecated) {
-  if (map->CanBeDeprecated()) {
-    Mov(scratch, Operand(map));
-    Ldrsw(scratch, FieldMemOperand(scratch, Map::kBitField3Offset));
-    TestAndBranchIfAnySet(scratch, Map::Deprecated::kMask, if_deprecated);
-  }
-}
-
-
 void MacroAssembler::JumpIfBlack(Register object,
                                  Register scratch0,
                                  Register scratch1,