[ObjectFifo] Add a pass to combine logical objFifos for connection reuse

-- This commit adds a new pass
   `--iree-amdaie-logical-objectfifos-for-connection-reuse`.
-- Essentially follows the narrative after splitting of logical objectFifos
   and is aimed to address point 4 of #644.

Signed-off-by: Abhishek Varma <abhvarma@amd.com>

compiler/plugins/target/AMD-AIE/iree-amd-aie/Transforms/AMDAIECombineLogicalObjFifosForConnectionReuse.cpp

@@ -0,0 +1,52 @@
+// Copyright 2024 The IREE Authors
+//
+// Licensed under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#include "iree-amd-aie/IR/AMDAIEOps.h"
+#include "iree-amd-aie/Transforms/AMDAIELogicalObjFifoSplittingUtils.h"
+#include "iree-amd-aie/Transforms/Passes.h"
+#include "mlir/IR/Iterators.h"
+#include "mlir/Pass/Pass.h"
+
+#define DEBUG_TYPE \
+  "iree-amdaie-combine-logical-objectfifos-for-connection-reuse"
+
+namespace mlir::iree_compiler::AMDAIE {
+
+namespace {
+
+class AMDAIECombineLogicalObjFifosForConnectionReusePass
+    : public impl::AMDAIECombineLogicalObjFifosForConnectionReuseBase<
+          AMDAIECombineLogicalObjFifosForConnectionReusePass> {
+ public:
+  using AMDAIECombineLogicalObjFifosForConnectionReuseBase::
+      AMDAIECombineLogicalObjFifosForConnectionReuseBase;
+
+  void getDependentDialects(DialectRegistry &registry) const override {
+    registry.insert<AMDAIEDialect>();
+  }
+  void runOnOperation() override;
+};
+
+void AMDAIECombineLogicalObjFifosForConnectionReusePass::runOnOperation() {
+  ModuleOp moduleOp = getOperation();
+  MLIRContext *context = &getContext();
+  IRRewriter rewriter(context);
+
+  SmallVector<AMDAIE::DmaCpyNdOp> l2ToL1DmaOps =
+      fetchDmaCpyNdOpsToSplitOrCombine(moduleOp);
+
+  if (failed(combineLogicalObjectFifos(rewriter, l2ToL1DmaOps, context))) {
+    return signalPassFailure();
+  }
+}
+
+}  // namespace
+
+std::unique_ptr<Pass>
+createAMDAIECombineLogicalObjFifosForConnectionReusePass() {
+  return std::make_unique<AMDAIECombineLogicalObjFifosForConnectionReusePass>();
+}
+
+}  // namespace mlir::iree_compiler::AMDAIE