[GIT-PULLS] [php-src] PR #22673: ir/aarch64: emit cbz/cbnz instead of cmp + b.ne

Pull Request: https://github.com/php/php-src/pull/22673
Author: henderkes

ir_emit_if_int used to emit 
```asm
cmp   w1, #0
b.ne  >refcount_path
```

and now emits 
```asm
cbnz  w1, >refcount_path
```

for 

```php
function f($x) {
    $s = "s" . $x;   // $s is a refcounted string
    unset($s);       // FREE: DELREF + maybe destroy, only if refcounted
}
```

LLM disclosure: this was fully found and done by Fable, all I did was verify correctness. ~ +1% in jit on phpbench for both Clang and GCC. No non-jit impact for obvious reasons.