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[NFC][Regalloc] Pass VirtRegMap by reference.

Authored by mtrofin on Oct 9 2020, 4:46 PM.



It's never null - the reason it's modeled as a pointer is because the
pass can't init it in its ctor. Passing by ref simplifies the code, too,
as the null checks were unnecessary complexity.

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mtrofin created this revision.Oct 9 2020, 4:46 PM
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mtrofin requested review of this revision.Oct 9 2020, 4:46 PM
MaskRay accepted this revision.Oct 9 2020, 8:25 PM

Looks great!

This revision is now accepted and ready to land.Oct 9 2020, 8:25 PM
This revision was automatically updated to reflect the committed changes.