Simplify test so that it is more portable.

I have checked that the test still fails when the "|| !P.isRegularFile()" from
the original patch is removed.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179464 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed