idea lgtm but no familiarity with the yaml

Thanks for your reviews!

Looking at the list of jobs again, I rethought that it's nice to have a view that has every job for each architecture so that you can monitor the test progress of a particular architecture by just opening one page. So I changed the way it's implemented, and it now lives under zjit-macos.yml. But it runs the same thing.

oh no :(

Failed to compile LIR at insn_idx=1735:
    x5 = LiveReg x5
    x11 = LiveReg x11
    x12 = LiveReg x12
    PatchPoint patch_point_89
    PosMarker
Command "../build/install/bin/ruby --zjit-call-threshold\\=2 -I harness /Users/runner/work/ruby/ruby/ruby-bench/benchmarks/lobsters/benchmark.rb" failed with exit code  in directory /Users/runner/work/ruby/ruby/ruby-bench
=>  Store Mem8[x29 - 0x18], Mem8[x29 - 8]

Heh, good thing I updated it again before landing it. I guess --zjit-call-threshold=2 compiles more than --zjit and it revealed more issues. I'll file a separate PR to add splits for them.

Filed #15057. I confirmed that it fixes crashes using the same setup as this PR.

As of filing #14936, they weren't reproducible. While I was waiting for reviews on it, #15033 was merged, and then I merged mine. So that seems to have triggered the lsr problem. I don't know which change triggered the Store issue, but I fixed it in the PR too.

They can be prevented once we merge this PR. But we need to land #15057 first.