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[ARM][MVE] findVCMPToFoldIntoVPS. NFC.

Authored by SjoerdMeijer on Dec 12 2019, 2:45 AM.

Description

[ARM][MVE] findVCMPToFoldIntoVPS. NFC.

This adds ReachingDefAnalysis (RDA) to the VPTBlock pass, so that we can
reimplement findVCMPToFoldIntoVPS with just a few calls to RDA.

Differential Revision: https://reviews.llvm.org/D71330