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Revert "AMDGPU: Temporary drop s_mul_hi_i/u32 patterns"
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Authored by arsenm on Jan 24 2020, 10:54 AM.

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Summary

This reverts commit fe23ed2c681413e7baf517c79aee9be130579873.

It was never really clear this was responsible for the performance
regressions that caused this to be reverted. It's been a long time,
and we need to have scalar patterns for this to get GlobalISel
working.

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