Array constructor expects AllocationSite or undefined as feedback.

src/a64/lithium-codegen-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 423 matching lines @@
 }
 
 
 void LCodeGen::DoCallNew(LCallNew* instr) {
   ASSERT(ToRegister(instr->context()).is(cp));
   ASSERT(instr->IsMarkedAsCall());
   ASSERT(ToRegister(instr->constructor()).is(x1));
 
   __ 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);
 
   ASSERT(ToRegister(instr->result()).is(x0));
 }
 
 
 void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
   ASSERT(instr->IsMarkedAsCall());
   ASSERT(ToRegister(instr->context()).is(cp));
   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 =
       (AllocationSite::GetMode(kind) == TRACK_ALLOCATION_SITE)
           ? DISABLE_ALLOCATION_SITES
           : DONT_OVERRIDE;
 
   if (instr->arity() == 0) {
     ArrayNoArgumentConstructorStub stub(kind, override_mode);
     CallCode(stub.GetCode(isolate()), RelocInfo::CONSTRUCT_CALL, instr);
@@ skipping 5364 matching lines @@
   __ Bind(&out_of_object);
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal