Revert "[Flang][OpenMP] Disable lowering of omp.simd reductions in co… (#113683)
…mposites (#112686)"
Lowering of reductions in composite operations can now be re-enabled,
since previous commits in this PR stack fix the MLIR representation
produced and it no longer triggers a compiler crash during translation
to LLVM IR.
This reverts commit c44860c8d2582abd88794267b4fa0fa953bbef80.