Symbols for type cells.

src/arm/builtins-arm.cc

Index: src/arm/builtins-arm.cc
diff --git a/src/arm/builtins-arm.cc b/src/arm/builtins-arm.cc
index 7898086c0745aac983f70a6b7ccf6fc5cf93bcf5..e9aec8e2a130674670692d1d0277e99241644005 100644
--- a/src/arm/builtins-arm.cc
+++ b/src/arm/builtins-arm.cc
@@ -155,10 +155,9 @@ 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> undefined_sentinel(
-      masm->isolate()->heap()->undefined_value(),
-      masm->isolate());
-  __ mov(r2, Operand(undefined_sentinel));
+  Handle<Object> megamorphic_sentinel =
+      TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
+  __ mov(r2, Operand(megamorphic_sentinel));
   ArrayConstructorStub stub(masm->isolate());
   __ TailCallStub(&stub);
 }
@@ -738,9 +737,9 @@ static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm,
     __ mov(r0, Operand(r3));
     if (is_construct) {
       // No type feedback cell is available
-      Handle<Object> undefined_sentinel(
-          masm->isolate()->heap()->undefined_value(), masm->isolate());
-      __ mov(r2, Operand(undefined_sentinel));
+      Handle<Object> megamorphic_sentinel =
+          TypeFeedbackInfo::MegamorphicSentinel(masm->isolate());
+      __ mov(r2, Operand(megamorphic_sentinel));
       CallConstructStub stub(NO_CALL_FUNCTION_FLAGS);
       __ CallStub(&stub);
     } else {