compiler: Add optional pass for runtime stability check

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.50000% with 11 lines in your changes are missing coverage. Please review.

Project coverage is 86.66%. Comparing base (32308f4) to head (aaea94a).

Files	Patch %	Lines
devito/passes/iet/errors.py	89.36%	2 Missing and 3 partials :warning:
devito/operator/operator.py	63.63%	3 Missing and 1 partial :warning:
devito/core/operator.py	50.00%	1 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2327 +/- ## ======================================= Coverage 86.66% 86.66% ======================================= Files 229 231 +2 Lines 43176 43260 +84 Branches 8004 8022 +18 ======================================= + Hits 37417 37490 +73 - Misses 5062 5068 +6 - Partials 697 702 +5 ```

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[FabioLuporini]

also added another tiny test