Eliminate extended mode, and other modes clean-up

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index ceb8e274989c7cc67711bc093c80696192cca28a..82261eee381b42c8393801ad113c9ccc62434ff1 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1075,11 +1075,11 @@ class Heap {
       Object* prototype,
       PretenureFlag pretenure = TENURED);
 
-  // Arguments object size.
-  static const int kArgumentsObjectSize =
+  // Sloppy mode arguments object size.
+  static const int kSloppyArgumentsObjectSize =
       JSObject::kHeaderSize + 2 * kPointerSize;
   // Strict mode arguments has no callee so it is smaller.
-  static const int kArgumentsObjectSizeStrict =
+  static const int kStrictArgumentsObjectSize =
       JSObject::kHeaderSize + 1 * kPointerSize;
   // Indicies for direct access into argument objects.
   static const int kArgumentsLengthIndex = 0;