[Analysis] Properly prepare test env in test/Analysis/undef-call.c
[Analysis] Properly prepare test env in test/Analysis/undef-call.c

The test expectes the '%T/ctudir' to be present, but does not create it.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@348124 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang,apple/swift-clang