compiler: Serialize copy-backs into the same Function from different buffers

[mloubout]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.28%. Comparing base (c6a977c) to head (2f09714).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3057   +/-   ##
=======================================
  Coverage   84.28%   84.28%           
=======================================
  Files         258      258           
  Lines       57056    57096   +40     
  Branches     4871     4878    +7     
=======================================
+ Hits        48087    48123   +36     
- Misses       8139     8142    +3     
- Partials      830      831    +1     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.69% <100.00%> (+0.16%)	⬆️
pytest-gpu-gcc-	79.00% <5.00%> (-0.05%)	⬇️
pytest-gpu-icx-	78.91% <5.00%> (-0.06%)	⬇️
pytest-gpu-nvc-nvidiaX	69.27% <100.00%> (+0.17%)	⬆️

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