cmd/internal/obj/arm64: add support for BTI instruction
Add support for the `BTI' instruction to the arm64 assembler. This
instruction provides Branch Target Identification for targets of
indirect branches. A BTI can be marked with a target type of
'C' (call), 'J' (jump) or 'JC' (jump or call).
Updates #66054
Change-Id: I1cf31a0382207bb75b9b2deb49ac298a59c00d8a
Reviewed-on: https://go-review.googlesource.com/c/go/+/646781
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Marvin Drees <marvin.drees@9elements.com> Reviewed-by: Cherry Mui <cherryyz@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>