Introduce gemm_softmax_gemm to codegen (#1542)

* Introduce ck_host library and gemm_softmax_gemm.

* Minor refactor.

* Add descriptor to gemm_softmax_gemm.

* Bugfix.

* Revert ck_host library.

* fix clang format

---------

Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>
Co-authored-by: illsilin <Illia.Silin@amd.com>

codegen/src/device_batched_gemm_softmax_gemm.cpp

@@ -0,0 +1,38 @@
+
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2018-2024, Advanced Micro Devices, Inc. All rights reserved.
+
+#include "ck/host/device_batched_gemm_softmax_gemm/problem.hpp"
+#include "ck/host/device_batched_gemm_softmax_gemm/operation.hpp"
+#include "ck/host/utils.hpp"
+#include <algorithm>
+
+namespace ck {
+namespace host {
+namespace device_batched_gemm_softmax_gemm {
+
+// return the relevant device op file based on the operation
+std::string Problem::GetIncludeHeader() const
+{
+    return "ck/tensor_operation/gpu/device/impl/device_batched_gemm_softmax_gemm_xdl_cshuffle.hpp";
+}
+
+// returns templated instances when provided with a problem specification
+std::vector<Solution> Problem::GetSolutions(const std::string& arch,
+                                            const std::string& prologue,
+                                            const std::string& epilogue) const
+{
+    if(get_xdlop_archs().count(arch) == 0)
+        return {};
+    auto ops = ck::host::device_batched_gemm_softmax_gemm::Operation_Xdl_CShuffle::CreateOperations(
+        *this, prologue, epilogue); // obtains vector of instances
+    std::vector<Solution> result;
+    std::transform(ops.begin(), ops.end(), std::back_inserter(result), [&](const auto& op) {
+        return op.ToSolution(); // template instance with correct values
+    });
+    return result;
+}
+
+} // namespace device_batched_gemm_softmax_gemm
+} // namespace host
+} // namespace ck