[llvm-dev] [RFC] Deprecating the legacy pass manager for the optimization pipeline

[Arthur Eubanks via llvm-dev]

The new pass manager has been on by default since the 13 branch. Now that
we've branched for 14, I'd like to start the process of deprecating and
removing legacy pass manager support for the optimization pipeline. This
includes clang, opt, and lld LTO support.

Note that this doesn't apply to the codegen pipeline since there's no new
pass manager support for that yet.

Are there any objections?
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