Track representations of fields

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 092aee5d47b5aed45eb1f1562021e92efd26a667..31fc179fa214d713ed8ba428d822533ae652446d 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2882,6 +2882,18 @@ void MacroAssembler::CheckPageFlagForMap(
 }
 
 
+void MacroAssembler::CheckMapDeprecated(Handle<Map> map,
+                                        Register scratch,
+                                        Label* if_deprecated) {
+  if (map->CanBeDeprecated()) {
+    mov(scratch, map);
+    mov(scratch, FieldOperand(scratch, Map::kBitField3Offset));
+    and_(scratch, Immediate(Smi::FromInt(Map::Deprecated::kMask)));
+    j(not_zero, if_deprecated);
+  }
+}
+
+
 void MacroAssembler::JumpIfBlack(Register object,
                                  Register scratch0,
                                  Register scratch1,