compiler: Misc tweaks for backend-portable code generation

[FabioLuporini]

[codecov[bot]]

Codecov Report

Merging #1984 (6194561) into master (c860a49) will decrease coverage by 0.02%. The diff coverage is 75.37%.

@@            Coverage Diff             @@
##           master    #1984      +/-   ##
==========================================
- Coverage   87.89%   87.87%   -0.03%     
==========================================
  Files         214      214              
  Lines       36251    36307      +56     
  Branches     5468     5477       +9     
==========================================
+ Hits        31864    31903      +39     
- Misses       3871     3886      +15     
- Partials      516      518       +2     

Impacted Files	Coverage Δ
devito/arch/compiler.py	44.05% <0.00%> (-0.49%)	:arrow_down:
devito/passes/iet/engine.py	93.33% <ø> (ø)
tests/test_dimension.py	100.00% <ø> (ø)
tests/test_gpu_openacc.py	7.08% <0.00%> (ø)
tests/test_gpu_openmp.py	4.16% <0.00%> (ø)
devito/passes/iet/orchestration.py	28.75% <25.00%> (+0.54%)	:arrow_up:
devito/passes/__init__.py	68.75% <61.53%> (-31.25%)	:arrow_down:
devito/passes/clusters/blocking.py	91.15% <66.66%> (-3.80%)	:arrow_down:
devito/types/object.py	91.66% <66.66%> (-0.72%)	:arrow_down:
devito/passes/iet/langbase.py	78.08% <90.90%> (+0.44%)	:arrow_up:
... and 12 more

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