Fix PDB injected sources test.

Fix PDB injected sources test.

This test was originally disabled because it was failing on a bot.
It turns out I had run dos2unix on the file, and that removed a
necessary byte from the file.  I'm just recomitting the proper
file and updating the test to test a little bit more now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327679 91177308-0d34-0410-b5e6-96231b3b80d8