Arthur Eubanks 2c7870dcca [NewPM] Add pipeline EP callback after initial frontend cleanup
This matches the legacy PM's EP_ModuleOptimizerEarly. Some backends use
this extension point and adding the pass somewhere else like
PipelineStartEPCallback doesn't work.

Reviewed By: ychen

Differential Revision: https://reviews.llvm.org/D91804
2020-11-24 21:14:36 -08:00
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