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[AArch64] Add support for MTE intrinsics

Description

[AArch64] Add support for MTE intrinsics
This provides intrinsics support for Memory Tagging Extension (MTE),
which was introduced with the Armv8.5-a architecture.
These intrinsics are available when __ARM_FEATURE_MEMORY_TAGGING is defined.
Each intrinsic is described in detail in the ACLE Q1 2019 documentation:
https://developer.arm.com/docs/101028/latest
Reviewed By: Tim Nortover, David Spickett
Differential Revision: https://reviews.llvm.org/D60485

Details

Committed
javed.absarApr 26 2019, 2:08 PM
Reviewer
david
Differential Revision
D60485: [AArch64] Add support for MTE intrinsics
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