[!319] adds fma node to substitution mapper

Merge branch 'feature/adds-fma-node-to-subst-mapper' into 'master'

See merge request [extensions/dune-codegen!319]

  [extensions/dune-codegen!319]: Noneextensions/dune-codegen/merge_requests/319

python/dune/codegen/loopy/symbolic.py

@@ -122,6 +122,7 @@ lp.type_inference.TypeInferenceMapper.map_vectorized_sumfact_kernel = needs_reso
 
 # FusedMultiplyAdd node
 lp.symbolic.IdentityMapper.map_fused_multiply_add = identity_map_fused_multiply_add
+lp.symbolic.SubstitutionMapper.map_fused_multiply_add = identity_map_fused_multiply_add
 lp.symbolic.WalkMapper.map_fused_multiply_add = walk_map_fused_multiply_add
 lp.symbolic.StringifyMapper.map_fused_multiply_add = stringify_map_fused_multiply_add
 lp.symbolic.DependencyMapper.map_fused_multiply_add = dependency_map_fused_multiply_add