ci: add job for macos-26 arm64

[jorgsowa]

No description provided.

[dstogov]

Unfortunately, MacOS/arm64 is not ready to be enabled. At least, there are some inconsistencies with disassembler that leads to false positive failures.

In e4451c4 I've added the test case from issue #134.
You may rebase this PR and re-run the tests.
I don't know how it may fail and how this may be related to MacOS.
This optimization is system independent.

[dstogov]

You can see https://github.com/dstogov/ir/actions/runs/24036658133/job/70100190123?pr=135 ./tests/cond_opt_001.irt is passed.

[jorgsowa]

Yes, that's true. I run it again and works fine. Maybe it was old codebase, or I messed up with something, sorry.

Should I keep open this PR to add ARM macos to CI pipeline?

[dstogov]

Should I keep open this PR to add ARM macos to CI pipeline?

Yeah, keep this open.
I won't merge this before fixing all the tests failures.
It seems most of them are false positive mismatches in disassembler output, but few are the real bugs.
However, mac support is not in the top of my TODO list.