compiler: Fix OpenMP reductions in tandem with linearize=True

[FabioLuporini]

No description provided.

[codecov]

Codecov Report

Merging #2117 (021e425) into master (e6f25d5) will increase coverage by 0.00%.
The diff coverage is 94.21%.

@@           Coverage Diff            @@
##           master    #2117    +/-   ##
========================================
  Coverage   87.71%   87.72%            
========================================
  Files         221      220     -1     
  Lines       39030    39151   +121     
  Branches     5075     5097    +22     
========================================
+ Hits        34236    34345   +109     
- Misses       4232     4242    +10     
- Partials      562      564     +2     

Impacted Files	Coverage Δ
devito/ir/support/properties.py	81.30% <ø> (-0.30%)	⬇️
devito/passes/iet/languages/openacc.py	62.03% <42.85%> (-3.51%)	⬇️
devito/passes/iet/linearization.py	82.93% <90.47%> (+0.83%)	⬆️
devito/passes/iet/parpragma.py	89.01% <98.24%> (+1.39%)	⬆️
devito/core/autotuning.py	93.85% <100.00%> (+0.10%)	⬆️
devito/ir/iet/nodes.py	91.98% <100.00%> (-0.33%)	⬇️
devito/ir/support/__init__.py	100.00% <100.00%> (ø)
devito/ir/support/syncs.py	60.31% <100.00%> (-1.23%)	⬇️
devito/ir/support/utils.py	86.50% <100.00%> (+0.16%)	⬆️
devito/passes/iet/languages/openmp.py	88.11% <100.00%> (-3.70%)	⬇️
... and 1 more

... and 8 files with indirect coverage changes

[georgebisbas]

I think it is fine