Fix atomicfields serialization for system image

[tkf]

fix #42387

[tkf]

@DilumAluthge Do I need to push the branch in JuliaLang/julia for running CI on https://buildkite.com/julialang/julia-master-experimental ?

[DilumAluthge]

Yeah you can't trigger a manual build if the branch isn't in the main repo.

[tkf]

Gotcha. Thanks.

[tkf]

@DilumAluthge I re-opened the PR as #42390 but https://buildkite.com/julialang/julia-master-experimental doesn't seem to show the build. Or do I just need to wait?

[DilumAluthge]

Oh that's right, I disabled experimental CI on PRs.

I manually triggered a build: https://buildkite.com/julialang/julia-master-experimental/builds/2016#6b04cc17-ccb0-4837-9d92-d1607bf000a3

On a separate note, I'll probably promote asan from "experimental" to "regular" soon, and then it'll run on PRs automatically.

[tkf]

I see. Thanks!