[PATCH] D123547: [docs] Mention that we are in the process of removing the legacy PM for the optimization pipeline

[Arthur Eubanks via Phabricator via cfe-commits]

aeubanks added a comment.

I tried regenerating ClangCommandLineReference.rst and it's a little out of date. I'll regenerate it in a separate change


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https://reviews.llvm.org/D123547