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build: Support PACBTI in AArch64 assembly

Daiki Ueno requested to merge ueno/nettle:wip/dueno/pacbti into master

This adds support for the branch protection mechanism provided in 64-bit Arm architecture, namely:

  • Armv8.3-A Pointer Authentication (PAC)
  • Armv8.5-A Branch Target Identification (BTI)

Note that PAC is currently unused in the assembly files as they only define leaf functions wrapped by the corresponding C functions, which will be instrumented by the compiler.

Signed-off-by: Daiki Ueno ueno@gnu.org

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