[llvm-branch-commits] [llvm] [PassBuilder][CodeGen] Add callback style pass buider (PR #116913)

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paperchalice wrote:

> Will new codegen support disabling individual passes? Instead of having separate arguments like `-disable-machine-sink` we could do `-disable-passes=machine-sink`.

I created #76714, but disabling arbitrary passes is not we expect. Maybe we could add an allowlist as a compromise...

https://github.com/llvm/llvm-project/pull/116913