Mircea Trofin 596a9f6b89 [NFC][Regalloc] Pass VirtRegMap by reference. ...

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.

Differential Revision: https://reviews.llvm.org/D89171

2020-10-12 08:32:30 -07:00

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