use memory layout info to copy task

[KDr2]

No description provided.

[yebai]

thanks, @KDr2 - looks good! I left some minor comments below.

Also, I would suggest that we keep the memlayout.cpp file under Libtask_jll. Assuming that we need to re-run memlayout inside a Github workflow, in order to get the member layout for a new Julia release, we can import Libtask_jll. However, this step can be done after the code becomes more mature to avoid frequent changes to Libtask_jll during the development phase.

[KDr2]

Now, it's ready to be reviewed and merged.

[yebai]

Looks good to me overall - one minor comment: maybe create a subfolder in workflows for tasklayout and store the Julia script and cpp source file inside tasklayout?

@devmotion This PR is attempting to crate a more maintainable version of Libtask by doing most of the task struct manipulation operations on the Julia side, and minimise the operations on the C side (i.e. in Libtask_jll). The solution here is not yet perfect, but operational, and already more generic than the current mechanism (e.g. it works correctly on Julia v.1.5.4 and v1.5.3). Can you take a look and see whether you have any comments?

[KDr2]

maybe create a subfolder in workflows for tasklayout and store the Julia script and cpp source file inside tasklayout?

Done.