Enable tight Objective-C interface layout unconditionally.

- I will remove the flag when I'm comfortable there is no fallout
   from this.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@70993 91177308-0d34-0410-b5e6-96231b3b80d8

tools/clang-cc/clang-cc.cpp

@@ -849,8 +849,7 @@ static void InitializeLanguageStandard(LangOptions &Options, LangKind LK,
   if (ObjCNonFragileABI)
     Options.ObjCNonFragileABI = 1;
   
-  if (ObjCTightLayout)
-    Options.ObjCTightLayout = 1;
+  Options.ObjCTightLayout = 1;
 
   if (EmitAllDecls)
     Options.EmitAllDecls = 1;