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Sjoerd Meijer authored
This is split off from D79100 and adds a new target hook emitGetActiveLaneMask that can be queried to check if the intrinsic @llvm.get.active.lane.mask() is supported by the backend and if it should be emitted for a given loop. See also commit rG7fb8a40e and its commit message for more details/context on this new intrinsic. Differential Revision: https://reviews.llvm.org/D80597
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