tree 07e3dec12d36e391c8d7bf5d5b3816954c507f0d
parent 1b2b7b2e70ce5ff50df917ee7745403d824155c5
author David Benjamin <davidben@google.com> 1663057432 -0700
committer Boringssl LUCI CQ <boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com> 1663092261 +0000

Use the new macOS sysctl names when available

At the time, there was no documentation (or I just couldn't find it) on
the correct sysctl names to query CPU features on Apple aarch64
platforms, so it was unclear what the relationship was between
"hw.optional.arm.FEAT_SHA512" and "hw.optional.armv8_2_sha512". There is
documentation now:
https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics

However, the documented names weren't available in macOS 11, and some
Arm Macs did ship with macOS 11. So query both names for macOS 11 compat
and in case some future version of macOS removes the old names.

Change-Id: I671d47576721b4c172feeb2e3f138c6bc55e39d6
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/54445
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: Bob Beck <bbe@google.com>
Reviewed-by: Bob Beck <bbe@google.com>