aarch64 glibc heap debug syms tcache detection not working because variable is optimized out

See https://github.com/pwndbg/pwndbg/actions/runs/34154457298/job/101843304674?pr=4133 and https://github.com/pwndbg/pwndbg/pull/4133#issuecomment-5634989580 .

I don't know if we have a better option here than downgrading to heuristic heap detection, maybe thats fine, but needs to be actually done.