[llvm-dev] registering passes at the beginning/end of opt passes (new pass manager)

[Juneyoung Lee via llvm-dev]

Hello all,

Can I register passes at the beginning/end of opt passes (new pass manager)?

I found that
registerPipelineStartEPCallback/registerOptimizerLastEPCallback work
successfully for clang, but they don't fire when opt -passes="" is used.

Thanks,
Juneyoung
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