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Commit c12f046e authored by Amara Emerson's avatar Amara Emerson
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[GlobalISel] Add new combine to convert scalar G_MUL to G_SHL. 

For pow2 constants we should use G_SHL for pattern matching (and perf)
purposes later.

Vector support not yet implemented.

Differential Revision: https://reviews.llvm.org/D73659
parent b9826408
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