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arm64: Use the pointer auth register defines
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Authored by andrew on Mon, May 20, 12:00 PM.
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Details

Summary

When building with gcc it complains the pointer authentication
registers aren't valid with the architecture level we are targeting.
Fix this by using the alternative spelling of these registers accesses
through MRS_REG_ALT_NAME.

Sponsored by: Arm Ltd

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rG FreeBSD src repository
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