[Arguments] Remove the arguments shadow symbol.

src/scopeinfo.h

Index: src/scopeinfo.h
diff --git a/src/scopeinfo.h b/src/scopeinfo.h
index dd49a4e08250405a756d155ac4dd39c3dfe184f9..3fde8db3102d1af35b0f6f52fdedd5974f30c0aa 100644
--- a/src/scopeinfo.h
+++ b/src/scopeinfo.h
@@ -112,11 +112,6 @@ class SerializedScopeInfo : public FixedArray {
   // Does this scope call eval?
   bool CallsEval();
 
-  // Does this scope have an arguments shadow?
-  bool HasArgumentsShadow() {
-    return StackSlotIndex(Heap::arguments_shadow_symbol()) >= 0;
-  }
-
   // Return the number of stack slots for code.
   int NumberOfStackSlots();