Revert "Merge arguments branch to bleeding merge."

src/scopeinfo.h

Index: src/scopeinfo.h
diff --git a/src/scopeinfo.h b/src/scopeinfo.h
index 86c33f61ffaf3a1bd38bc8d38665a83ec0181c41..ff7201355fe3aab3544862b1fbbb650cb23d53d8 100644
--- a/src/scopeinfo.h
+++ b/src/scopeinfo.h
@@ -117,6 +117,11 @@ class SerializedScopeInfo : public FixedArray {
   // Is this scope a strict mode scope?
   bool IsStrictMode();
 
+  // Does this scope have an arguments shadow?
+  bool HasArgumentsShadow() {
+    return StackSlotIndex(GetHeap()->arguments_shadow_symbol()) >= 0;
+  }
+
   // Return the number of stack slots for code.
   int NumberOfStackSlots();