simplify the code used to compute the type of an objc string.  This makes it faster in the common case when NSConstantString is around.
simplify the code used to compute the type of an objc string.  This makes
it faster in the common case when NSConstantString is around.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@64895 91177308-0d34-0410-b5e6-96231b3b80d8

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