Default builtin creation to off; we don't really want to be doing it  without a relevant source location anyway.  Fixes the issue with weird  warnings when including objc/Object.h on OS X.
Default builtin creation to off; we don't really want to be doing it 
without a relevant source location anyway.  Fixes the issue with weird 
warnings when including objc/Object.h on OS X.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@72978 91177308-0d34-0410-b5e6-96231b3b80d8

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