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[GlobalISel] Enable copy-propagation in post-legalizer combiner.

Authored by aemerson on Aug 14 2020, 1:37 AM.

Description

[GlobalISel] Enable copy-propagation in post-legalizer combiner.

This cleans up copies that the legalizer or other combines leave around. They
can occasionally end up escaping as moves.

Differential Revision: https://reviews.llvm.org/D85964

Details