Track representations of fields

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index 3f8d92275f53e57acc306c96db8def46408affff..a08daa7df1bddb67430600121196f7c863c4ff82 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -3402,6 +3402,18 @@ void MacroAssembler::CheckPageFlag(
 }
 
 
+void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
+                                        Register scratch,
+                                        Label* if_deprecated) {
+  if (map->CanBeDeprecated()) {
+    mov(scratch, Operand(map));
+    ldr(scratch, FieldMemOperand(scratch, Map::kBitField3Offset));
+    tst(scratch, Operand(Smi::FromInt(Map::Deprecated::kMask)));
+    b(ne, if_deprecated);
+  }
+}
+
+
 void MacroAssembler::JumpIfBlack(Register object,
                                  Register scratch0,
                                  Register scratch1,