transformations: (convert-ptr-to-llvm) add lowering for ptr to llvm

[kaylendog]

WIP: Adds a pass, convert-ptr-to-llvm, for lowering the ptr_xdsl dialect to llvm.

TODO

• Filecheck tests
• Remove unsquashed commits(?)
• Better realization of type sizes
• Inference for pointee types, may require modification to ptr?

There's also a revert to 27bf821 as it breaks xdsl-opt.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.16%. Comparing base (73437cd) to head (b1f374b).
Report is 27 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3825      +/-   ##
==========================================
- Coverage   91.25%   91.16%   -0.10%     
==========================================
  Files         461      462       +1     
  Lines       57630    57748     +118     
  Branches     5567     5587      +20     
==========================================
+ Hits        52591    52644      +53     
- Misses       3612     3675      +63     
- Partials     1427     1429       +2     

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[compor]

good stuff overall; I wouldn't worry about the unsquashed commits.
Wrt the reverted commit, not sure why it breaks your local xdsl-opt, but maybe something for later.

[superlopuh]

please remove all todos in this file, either by addressing them, or by filing issues, let's discuss this

[superlopuh]

we have a helper for this, it should just be op.elem_type.size if it's a FixedBitwidthType, we might want to raise an error otherwise.

[mamanain]

Btw I merged the type offset conversion pass so maybe you can just use it in this case

[superlopuh]

let's try that

[superlopuh]

Let's iterate on this? It would be good to merge everything you used, and throw away the rest