compiler: load so directly when source is missing (e.g deleted c file)

[mloubout]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.48%. Comparing base (2fa5517) to head (e16a579).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2888   +/-   ##
=======================================
  Coverage   83.48%   83.48%           
=======================================
  Files         248      248           
  Lines       51472    51496   +24     
  Branches     4434     4434           
=======================================
+ Hits        42969    42991   +22     
- Misses       7753     7755    +2     
  Partials      750      750           

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.81% <100.00%> (+<0.01%)	⬆️
pytest-gpu-gcc-	78.08% <100.00%> (+0.01%)	⬆️
pytest-gpu-icx-	77.72% <100.00%> (+0.02%)	⬆️
pytest-gpu-nvc-nvidiaX	69.33% <100.00%> (+0.01%)	⬆️

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[FabioLuporini]

few minor tweaks needed but basically almost gtg