arm64/disassem.c: Add detection of xzr and sp
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Authored by koliagogsadze_gmail.com on Apr 27 2023, 10:44 PM.

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mhorne
andrew
manu

Summary

Added support to distinguish between XZR/WZR and SP/WSP.
registers. Also "wSP" and "SP" were removed from w_reg and x_reg, since
num 31 can be SP or XZR, so a helper functions were introduced for this purpose
in arm64_reg to detect correct x31 register and added special
flags to determine if the instruction should be sp or xzr.

Test Plan

tested in the branch arm64-xzr-sp-support-tests:
https://github.com/toor1245/freebsd-src/pull/1/files
https://github.com/toor1245/freebsd-src/blob/arm64-xzr-sp-support-tests/sys/arm64/arm64/disassem.c