Remove the default case from the unary type trait evaluation function, adding an unreachable annotation. Remarkably this one was already enumarting every trait.
Remove the default case from the unary type trait evaluation function,
adding an unreachable annotation. Remarkably this one was already
enumarting every trait.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@130647 91177308-0d34-0410-b5e6-96231b3b80d8

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