Revert "[IRVerifier] Don't crash on invalid DIFile inside DISubprogram."

This reverts commit r265515 as lots of tests need to be fixed before
this actually can go in.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@265517 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed