[UpdateTestChecks] Emit warning when invalid test paths

Summary:
Recently I ran into the following issue:

./update_test_checks.py /path/not-existing-file.ll

The script was silent and I was suprised why the real test file hadn't been updated.

Solution:
Emit warning if we detect this problem.



Reviewers: lebedev.ri, spatel, jdoerfert, nikic

Reviewed By: lebedev.ri, spatel, jdoerfert, nikic

Subscribers: jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64572

llvm-svn: 365818
1 file changed
tree: 9720adcfae0f1e5a5fb7f0f37283c810f863751f
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. .arcconfig
  18. .clang-format
  19. .clang-tidy
  20. .gitignore
  21. README.md
README.md

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