[PATCH] D139717: Revert "[Driver] Remove Joined -X"

[Fangrui Song via Phabricator via cfe-commits]

MaskRay added a comment.

In D139717#3986227 <https://reviews.llvm.org/D139717#3986227>, @manojgupta wrote:

> The removal is also breaking ChromeOS builds which use -Xpattern in some cases.

Do you have a justifying example showing which `-Xpattern` is used? It needs to do useful work, instead of just using an option which happened to be ignored (and probably not ignored by GCC).


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