Enable tight Objective-C interface layout unconditionally.  - I will remove the flag when I'm comfortable there is no fallout    from this.
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: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@70993 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang,apple/swift-clang,llvm-mirror/clang,llvm-mirror/clang,llvm-mirror/clang