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[ARM][MVE] Fix for tail predication for loops containing MVE gather/scatters

Authored by anwel on Aug 13 2020, 4:22 AM.

Description

[ARM][MVE] Fix for tail predication for loops containing MVE gather/scatters

Fix to include non-predicated version of write-back gather in special case
treatment for deducting the instruction type.
(This is fixing https://reviews.llvm.org/D85138 for corner cases)

Differential Revision: https://reviews.llvm.org/D85889