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[AArch64][v8.5A] Add prediction invalidation instructions to AArch64

Authored by olista01 on Sep 27 2018, 6:47 AM.

Description

[AArch64][v8.5A] Add prediction invalidation instructions to AArch64

This adds new system instructions which act as barriers to speculative
execution based on earlier execution within a particular execution
context.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52479

llvm-svn: 343214