Fix rdar://6518463, increment of a bool is always true, due to subtle and non-obvious promotion rules.  We already handle +=  and +1 correctly.
Fix rdar://6518463, increment of a bool is always true, due to
subtle and non-obvious promotion rules.  We already handle += 
and +1 correctly.


git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@64296 91177308-0d34-0410-b5e6-96231b3b80d8

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