Examples: enforce stable space order for self adjoint op

[mloubout]

No description provided.

[codecov]

Codecov Report

Merging #1747 (465c67d) into master (18c842a) will decrease coverage by 1.52%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1747      +/-   ##
==========================================
- Coverage   89.62%   88.10%   -1.53%     
==========================================
  Files         209      209              
  Lines       33676    33679       +3     
  Branches     4368     4369       +1     
==========================================
- Hits        30182    29672     -510     
- Misses       2996     3512     +516     
+ Partials      498      495       -3     

Impacted Files	Coverage Δ
examples/seismic/self_adjoint/example_iso.py	50.00% <100.00%> (+3.48%)	⬆️
tests/test_gpu_openacc.py	5.80% <0.00%> (-92.26%)	⬇️
devito/ir/iet/efunc.py	40.62% <0.00%> (-50.00%)	⬇️
devito/passes/iet/orchestration.py	18.71% <0.00%> (-43.28%)	⬇️
devito/passes/clusters/asynchrony.py	12.34% <0.00%> (-22.64%)	⬇️
devito/passes/iet/languages/openacc.py	72.82% <0.00%> (-20.66%)	⬇️
devito/operator/symbols.py	84.61% <0.00%> (-15.39%)	⬇️
devito/ir/iet/utils.py	67.50% <0.00%> (-12.50%)	⬇️
devito/arch/compiler.py	47.60% <0.00%> (-10.55%)	⬇️
devito/types/parallel.py	79.59% <0.00%> (-8.58%)	⬇️
... and 20 more

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