This reverts commit d987b61b1d. As pointed out in https://reviews.llvm.org/D95388, the reverted commit causes build failures in the following Flang buildbots: * http://lab.llvm.org:8011/#/builders/32/builds/2642 * http://lab.llvm.org:8011/#/builders/33/builds/2131 * http://lab.llvm.org:8011/#/builders/135/builds/1473 * http://lab.llvm.org:8011/#/builders/66/builds/1559 * http://lab.llvm.org:8011/#/builders/134/builds/1409 * http://lab.llvm.org:8011/#/builders/132/builds/1817 I'm guessing that the patch was only tested with `FLANG_BUILD_NEW_DRIVER=Off` (i.e. the default). The builders listed above set `FLANG_BUILD_NEW_DRIVER` to `On`. Although fixing the build is relatively easy, the reverted patch modifies the behaviour of the frontend, which breaks driver tests. In particular, in https://reviews.llvm.org/D93453 support for `-I` was added that depends on the current behaviour. The reverted patch changes that behaviour. Either the tests have to be updated or the change fine-tuned.
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