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MTE and BTI are Armv8.5-A features which help memory safety and
control-flow integrity. This CL adds support for detecting them
using the AT_HWCAP2 Linux API.

MTE contains new instructions which will crash older cores. base::CPU
can now be used to tell whether these instructions are safe to
execute and adds a test to verify this. This does not test whether
MTE is configured correctly to give any security properties, a
subsequent CL will add tests for this.

Bug: 1145581, 1137393
Change-Id: I9abd66af1c1bdbf49eebd17f225a59b0a6cdfd33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2526738
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831180}