compiler: Memoise unbounded

[EdCaunt]

Yields moderate compilation speedup for CPML-like operators (possibly others too)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.27%. Comparing base (0164e85) to head (bb4833c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3056      +/-   ##
==========================================
+ Coverage   84.26%   84.27%   +0.01%     
==========================================
  Files         258      258              
  Lines       56982    56983       +1     
  Branches     4854     4854              
==========================================
+ Hits        48016    48023       +7     
+ Misses       8139     8135       -4     
+ Partials      827      825       -2     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	68.57% <100.00%> (+<0.01%)	⬆️
pytest-gpu-gcc-	79.03% <100.00%> (+<0.01%)	⬆️
pytest-gpu-icx-	78.97% <100.00%> (-0.01%)	⬇️
pytest-gpu-nvc-nvidiaX	69.14% <100.00%> (+0.01%)	⬆️

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