compiler: Optimize normalize_reductions_dense

[codecov[bot]]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8129669) 86.69% compared to head (75d8d81) 86.69%.

Files	Patch %	Lines
devito/ir/clusters/algorithms.py	66.66%	1 Missing and 2 partials :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2311 +/- ## ========================================== - Coverage 86.69% 86.69% -0.01% ========================================== Files 229 229 Lines 42978 42983 +5 Branches 7966 7967 +1 ========================================== + Hits 37259 37262 +3 - Misses 5032 5033 +1 - Partials 687 688 +1 ```

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