compiler: Enhance IR for GPU codegen

[FabioLuporini]

Not much to see here honestly, just a couple of minor additions that I need in PRO

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.07%. Comparing base (661939b) to head (b3c2589).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
devito/types/array.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2555      +/-   ##
==========================================
- Coverage   92.07%   92.07%   -0.01%     
==========================================
  Files         238      238              
  Lines       47032    47038       +6     
  Branches     4143     4143              
==========================================
+ Hits        43303    43308       +5     
- Misses       3077     3078       +1     
  Partials      652      652              

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	72.60% <72.72%> (+<0.01%)	⬆️
pytest-gpu-nvc-nvidiaX	73.64% <72.72%> (+<0.01%)	⬆️

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[EdCaunt]

Looks good to me