Array constructor expects AllocationSite or undefined as feedback.

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 6c29abdcff467eaf2cfa923d92ce7438ae20195d..7b491a7cded781456b2e5f2b6f709b17e80f2fde 100644
--- a/src/a64/lithium-codegen-a64.cc
+++ b/src/a64/lithium-codegen-a64.cc
@@ -441,9 +441,7 @@ void LCodeGen::DoCallNew(LCallNew* instr) {
 
   __ Mov(x0, instr->arity());
   // No cell in x2 for construct type feedback in optimized code.
-  Handle<Object> megamorphic_symbol =
-      TypeFeedbackInfo::MegamorphicSentinel(isolate());
-  __ Mov(x2, Operand(megamorphic_symbol));
+  __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
 
   CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
   CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
@@ -458,7 +456,7 @@ void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
   ASSERT(ToRegister(instr->constructor()).is(x1));
 
   __ Mov(x0, Operand(instr->arity()));
-  __ Mov(x2, Operand(TypeFeedbackInfo::MegamorphicSentinel(isolate())));
+  __ LoadRoot(x2, Heap::kUndefinedValueRootIndex);
 
   ElementsKind kind = instr->hydrogen()->elements_kind();
   AllocationSiteOverrideMode override_mode =