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[Target][ARM] Improvements to the VPT Block Insertion Pass

Authored by Pierre-vh on Mar 9 2020, 9:40 AM.

Description

[Target][ARM] Improvements to the VPT Block Insertion Pass

This allows the MVE VPT Block insertion pass to remove VPNOTs in
order to create more complex VPT blocks such as TE, TEET, TETE, etc.

Differential Revision: https://reviews.llvm.org/D75993