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[DAGCombiner] Fold an AND of a masked load into a zext_masked_load

Authored by samtebbs on Tue, Sep 1, 7:36 AM.

Description

[DAGCombiner] Fold an AND of a masked load into a zext_masked_load

This patch folds an AND of a masked load and build vector into a zero
extended masked load.

Differential Revision: https://reviews.llvm.org/D86789