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* YJIT: A64: Add CBZ and CBNZ encoding functions * YJIT: A64: Use CBZ/CBNZ to check for zero Instead of emitting `cmp x0, #0` plus `b.z #target`, A64 offers Compare and Branch on Zero for us to just do `cbz x0, #target`. This commit utilizes that and the related CBNZ instruction when appropriate. We check for zero most commonly in interrupt checks: ```diff # Insn: 0003 leave (stack_size: 1) # RUBY_VM_CHECK_INTS(ec) ldur w11, [x20, #0x20] -tst w11, w11 -b.ne #0x109002164 +cbnz w11, #0x1049021d0 ``` * fix copy paste error Co-authored-by: Randy Stauner <randy@r4s6.net> --------- Co-authored-by: Randy Stauner <randy@r4s6.net>