Revert of Replace LANGUAGE_END with LAST_LANGUAGE_MODE

src/ast/scopes.h

Index: src/ast/scopes.h
diff --git a/src/ast/scopes.h b/src/ast/scopes.h
index ef52aed77afa0c290c740f4deeba2e1f070fa1bd..72d04a594664b4101742012977c17d4d23a5a2a3 100644
--- a/src/ast/scopes.h
+++ b/src/ast/scopes.h
@@ -496,7 +496,7 @@
   // Scope-specific information computed during parsing.
   //
   // The language mode of this scope.
-  STATIC_ASSERT(LAST_LANGUAGE_MODE == 1);
+  STATIC_ASSERT(LANGUAGE_END == 2);
   LanguageMode language_mode_ : 1;
   // This scope is inside a 'with' of some outer scope.
   bool scope_inside_with_ : 1;