MaskRay added a comment.

> This change is breaking internal builds. We use the -Xfoo pattern but can now 
> no longer manage whether we allow an unused -Xfoo option to pass as a warning 
> or promote it to an error.

Which `-Xfoo` is used? Do your internal builds reserve `-Xfoo` as a placeholder 
to do other non-upstream work? Then you can consider `-Gfoo` if your builds 
don't need the mips semantics.
Is it possible to clean up the previously-ignored-with-a-warning `-Xfoo`?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139717/new/

https://reviews.llvm.org/D139717

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