[CK] Added s_prefetch unit test.

-added s_buffer_load_b32/64 assembly
-added amd_s_buffer_load_impl

Signed-off-by: Michal Kulikowski <Michal.Kulikowski@amd.com>


[ROCm/composable_kernel commit: f3ef7acca0]

test/s_prefetch_op/s_prefetch_op.cpp

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2025, Advanced Micro Devices, Inc. All rights reserved.
+
+#include <algorithm>
+#include <cstdlib>
+#include <iostream>
+#include <numeric>
+#include <tuple>
+#include <vector>
+#include <chrono>
+
+#include "ck/ck.hpp"
+#include "ck/library/utility/device_memory.hpp"
+#include "ck/library/utility/host_tensor.hpp"
+#include "ck/library/utility/check_err.hpp"
+#include "ck/host_utility/hip_check_error.hpp"
+#include "ck/host_utility/device_prop.hpp"
+
+#include <hip/hip_runtime.h>
+
+#if __clang_major__ >= 20
+#include "ck/utility/amd_buffer_addressing_builtins.hpp"
+#else
+#include "ck/utility/amd_buffer_addressing.hpp"
+#endif
+
+#include "s_prefetch_op_util.hpp"
+
+template <typename T>
+bool run_test()
+{
+    bool pass = true;
+
+    const auto s_prefetch_kernel = ck::s_prefetch_op_util::kernel_with_scalar_prefetch<T>;
+    const auto s_buffer_prefetch_kernel =
+        ck::s_prefetch_op_util::kernel_with_scalar_buffer_prefetch<T>;
+
+    const auto prefetch_kernel_container =
+        std::make_tuple(s_prefetch_kernel, s_buffer_prefetch_kernel);
+
+    ck::static_for<0, 2, 1>{}([&](auto i) {
+        std::string kernel_name = (i == 1 ? "s_buffer_prefetch" : "s_prefetch");
+        pass &= ck::s_prefetch_op_util::test_constant_prefetch_impl<
+            decltype(std::get<ck::Number<i>{}>(prefetch_kernel_container)),
+            T>(std::get<ck::Number<i>{}>(prefetch_kernel_container), kernel_name);
+    });
+
+    return pass;
+}
+
+int main(int, char*[])
+{
+    if(!ck::is_gfx12_supported())
+    {
+        std::cout << "This feature is not supported by current HW, skipping tests." << std::endl;
+        return 0;
+    }
+
+    bool pass = true;
+
+    std::cout << "=== Testing Constant Cache Prefetch ===" << std::endl;
+
+    // Test different data types
+    pass &= run_test<float>();
+    pass &= run_test<double>();
+
+    std::cout << "TestConstantPrefetch ..... " << (pass ? "SUCCESS" : "FAILURE") << std::endl;
+    return pass ? 0 : 1;
+}