compiler: add top description to generated file

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[codecov]

Codecov Report

Attention: Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 91.31%. Comparing base (9fa537f) to head (3e77abb).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
devito/ir/iet/visitors.py	44.44%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2652      +/-   ##
==========================================
- Coverage   92.00%   91.31%   -0.70%     
==========================================
  Files         245      245              
  Lines       48802    48813      +11     
  Branches     4307     4310       +3     
==========================================
- Hits        44902    44572     -330     
- Misses       3208     3530     +322     
- Partials      692      711      +19     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	72.57% <58.33%> (-0.01%)	⬇️
pytest-gpu-nvc-nvidiaX	?

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