Evgenii Kudriashov cfd91199ca [X86] Skip unused VRegs traverse (#78229) ...

Almost all loops with getNumVirtRegs skip unused registers by means
of reg_nodbg_empty or empty live interval. Except for these two cases
that are revealed by GlobalISel since it can skip RegClass assignment
for unused registers.

Closes #64452, closes #71926

2024-01-26 23:57:14 +01:00

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