feat(compiler): Run SCFForallToSCFFor pass before lowering to LLVM dialect

This adds an invocation of the `SCFForallToSCFFor` pass to the
compilation pipeline before lowering to the LLVM dialect as a
sequential fallback path to future passes exploiting the parallelism
of `scf.forall` further up in the pipeline.

compilers/concrete-compiler/compiler/lib/Support/Pipeline.cpp

@@ -479,6 +479,9 @@ mlir::LogicalResult lowerToStd(mlir::MLIRContext &context,
       pm, mlir::bufferization::createEmptyTensorToAllocTensorPass(),
       enablePass);
 
+  addPotentiallyNestedPass(
+      pm, mlir::concretelang::createSCFForallToSCFForPass(), enablePass);
+
   // Bufferize
   mlir::bufferization::OneShotBufferizationOptions bufferizationOptions;
   bufferizationOptions.allowReturnAllocs = true;