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[ARM] Fold predicate_cast(load) into vldr p0

Authored by dmgreen on Sep 4 2020, 3:29 AM.

Description

[ARM] Fold predicate_cast(load) into vldr p0

This adds a simple tablegen pattern for folding predicate_cast(load)
into vldr p0, providing the alignment and offset are correct.

Differential Revision: https://reviews.llvm.org/D86702

Details