Integrate MLGO into CLGEMM and CLGEMMLowpMatrixMultiplyCore: Part1

* Create a new public handle class CLGEMMHeuristicsHandle
  It is responsible for the loading and lifetime management of the
  underlying heuristics

* Add to_string utility to several mlgo constructs for logging

Resolves: COMPMID-3843, COMPMID-3844

Signed-off-by: SiCong Li <sicong.li@arm.com>
Change-Id: Ib9c65e076daa6a9a204999cde9abf366dbabc496
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5001
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/CL/CLGEMMHeuristicsHandle.h b/arm_compute/runtime/CL/CLGEMMHeuristicsHandle.h
new file mode 100644
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+++ b/arm_compute/runtime/CL/CLGEMMHeuristicsHandle.h
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+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_RUNTIME_CL_CL_GEMM_HEURISTICS_HANDLE_H
+#define ARM_COMPUTE_RUNTIME_CL_CL_GEMM_HEURISTICS_HANDLE_H
+
+#include <memory>
+
+namespace arm_compute
+{
+namespace mlgo
+{
+/** Forward declaration for the underlying heuristics: MLGOHeuristics */
+class MLGOHeuristics;
+} // namespace mlgo
+
+/** Handle for loading and retrieving GEMM heuristics */
+class CLGEMMHeuristicsHandle
+{
+public:
+    /** Constructor */
+    CLGEMMHeuristicsHandle();
+    /** Destructor */
+    ~CLGEMMHeuristicsHandle();
+    /** Prevent Copy Construct */
+    CLGEMMHeuristicsHandle(const CLGEMMHeuristicsHandle &) = delete;
+    /** Prevent Copy Assignment */
+    CLGEMMHeuristicsHandle &operator=(const CLGEMMHeuristicsHandle &) = delete;
+    /** Default Move Constructor */
+    CLGEMMHeuristicsHandle(CLGEMMHeuristicsHandle &&) = default;
+    /** Default Move Assignment */
+    CLGEMMHeuristicsHandle &operator=(CLGEMMHeuristicsHandle &&) = default;
+    /** (Re)Load the heuristics from reading a dotmlgo file
+     *
+     * @param[in] filename Path to the dotmlgo file
+     *
+     * @return bool Signals if the reload succeeded or failed
+     */
+    bool reload_from_file(const std::string &filename);
+    /** Return a pointer to underlying heuristics for querying purposes
+     *
+     * @return MLGOHeuristics*
+     */
+    const mlgo::MLGOHeuristics *get() const;
+
+private:
+    std::unique_ptr<mlgo::MLGOHeuristics> _heuristics; /**< Pointer to underlying heuristics */
+};
+
+} // namespace arm_compute
+
+#endif // ARM_COMPUTE_RUNTIME_CL_CL_GEMM_HEURISTICS_HANDLE_H
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