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RegisterCoalescer: Remove dubious dropping of implicit virtual register defs
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Authored by arsenm on Jul 25 2023, 2:44 PM.

Details

Summary

Don't understand why this would either be OK or necessary, but doesn't
appear to happen in any tests. This was introduced way back in
76e66c31a0481e72d1ff86c56028d850b6c33cff

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