Array constructor expects AllocationSite or undefined as feedback.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index d4f5e037300c9f974044ace76383633d077fb031..a5d010cf799fd48f7f1cfe0c4d34ef9753bf651e 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -533,9 +533,7 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
     // Invoke the code.
     if (is_construct) {
       // No type feedback cell is available
-      Handle<Object> megamorphic_sentinel =
-          TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
-      __ Move(rbx, megamorphic_sentinel);
+      __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
       // Expects rdi to hold function pointer.
       CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
       __ CallStub(&stub);
@@ -1128,9 +1126,7 @@ void Builtins::Generate_ArrayCode(MacroAssembler* masm) {
 
   // Run the native code for the Array function called as a normal function.
   // tail call a stub
-  Handle<Object> megamorphic_sentinel =
-      TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
-  __ Move(rbx, megamorphic_sentinel);
+  __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }