Florian Hahn 43f0f1a66f
[VPlan] Use onlyFirstLaneUsed in sinkScalarOperands.
Replace custom code to check if only the first lane is used by generic
helper `onlyFirstLaneUsed`. This enables VPlan-based sinking in a few
additional cases and was suggested in D133760.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D136368
2022-10-29 19:45:19 +01:00
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