clang/test/Tooling: Remove XFAIL in 5 tests to unveil the real failure.

FYI, they can pass on Cygwin w/o any tweaks.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@156930 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed