ObjectiveC migrator. In infering NS_ENUM/NS_OPTIONS
macros, prefer the typedef immediately following the
enum declaration to the one preceeding it.
// rdar://15200915


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192927 91177308-0d34-0410-b5e6-96231b3b80d8