Sanjay Patel 67e9151096 [x86] try harder to use shift instead of test if it can save some immediate bytes ...

We favor 'and' and 'test' in earlier phases of optimization,
and that's usually the better option, but we can save a few
instruction bytes by converting a mask constant to a shift here.

Differential Revision: https://reviews.llvm.org/D121147

2022-03-17 09:10:57 -04:00

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