[PATCH] D142757: [clang][driver] Emit an error for `/clang:-x`

[Nico Weber via Phabricator via cfe-commits]

thakis added a comment.

This breaks tests on Mac: http://45.33.8.238/macm1/54097/step_7.txt

Please take a look and revert for now if it takes a while to fix.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D142757/new/

https://reviews.llvm.org/D142757