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[AArch64][v8.5A] Add speculation barrier to AArch64 instruction set

Authored by olista01 on Sep 27 2018, 6:39 AM.

Description

[AArch64][v8.5A] Add speculation barrier to AArch64 instruction set

This is a new barrier which limits speculative execution of the
instructions following it.

Patch by Pablo Barrio!

Differential revision: https://reviews.llvm.org/D52476

llvm-svn: 343211