Symbols for type cells.

src/a64/lithium-codegen-a64.cc

Index: src/a64/lithium-codegen-a64.cc
diff --git a/src/a64/lithium-codegen-a64.cc b/src/a64/lithium-codegen-a64.cc
index 2bad671197fec3743a3ece7c0d1815a2a90a55d1..742d37895c283df7f501a55e96cdbd8c3f69af49 100644
--- a/src/a64/lithium-codegen-a64.cc
+++ b/src/a64/lithium-codegen-a64.cc
@@ -445,8 +445,9 @@ void LCodeGen::DoCallNew(LCallNew* instr) {
 
   __ Mov(x0, instr->arity());
   // No cell in x2 for construct type feedback in optimized code.
-  Handle<Object> undefined_value(isolate()->factory()->undefined_value());
-  __ Mov(x2, Operand(undefined_value));
+  Handle<Object> megamorphic_symbol =
+      TypeFeedbackInfo::MegamorphicSentinel(isolate());
+  __ Mov(x2, Operand(megamorphic_symbol));
 
   CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
   CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
@@ -461,7 +462,7 @@ void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
   ASSERT(ToRegister(instr->constructor()).is(x1));
 
   __ Mov(x0, Operand(instr->arity()));
-  __ Mov(x2, Operand(factory()->undefined_value()));
+  __ Mov(x2, Operand(TypeFeedbackInfo::MegamorphicSentinel(isolate())));
 
   ElementsKind kind = instr->hydrogen()->elements_kind();
   AllocationSiteOverrideMode override_mode =