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[AArch64][v8.5A] Add Branch Target Identification instructions

Authored by olista01 on Sep 27 2018, 7:54 AM.

Description

[AArch64][v8.5A] Add Branch Target Identification instructions

This adds new instructions used by the Branch Target Identification
feature. When this is enabled, these are the only instructions which can
be targeted by indirect branch instructions.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52485

llvm-svn: 343225