Move CPU/GPU files from Core/Runtime to the respective backend folders

Legacy structure contained two libraries core/runtime with two backends
in each.
We reduce the core/runtime libraries to a single library thus merging
the backend files

Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Change-Id: I69545765fe7a730368105cdbd067d3135ec7a174
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/6155
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/gpu/cl/kernels/ClGemmReshapeLhsMatrixKernel.h b/src/gpu/cl/kernels/ClGemmReshapeLhsMatrixKernel.h
new file mode 100644
index 0000000..69ec8f0
--- /dev/null
+++ b/src/gpu/cl/kernels/ClGemmReshapeLhsMatrixKernel.h
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2018-2021 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_CL_GEMM_RESHAPE_LHS_MATRIX_KERNEL_H
+#define ARM_COMPUTE_CL_GEMM_RESHAPE_LHS_MATRIX_KERNEL_H
+
+#include "src/core/common/Macros.h"
+#include "src/gpu/cl/ClCompileContext.h"
+#include "src/gpu/cl/IClKernel.h"
+
+namespace arm_compute
+{
+namespace opencl
+{
+namespace kernels
+{
+/** OpenCL kernel to reshape the LHS matrix when performing the matrix multiplication.
+ *  In particular, this function splits the src matrix in blocks of size M0xK0 (defined through GEMMLHSInfo) and
+ *  stores each one in the dst matrix unrolling the values
+ */
+class ClGemmReshapeLhsMatrixKernel : public ICLKernel
+{
+public:
+    ClGemmReshapeLhsMatrixKernel();
+    ARM_COMPUTE_DISALLOW_COPY_ALLOW_MOVE(ClGemmReshapeLhsMatrixKernel);
+    /** Initialise the kernel's input and output.
+     *
+     * @param[in]  compile_context       The compile context to be used.
+     * @param[in]  src                   Input tensor. Data types supported: All
+     * @param[out] dst                   Output tensor. Data type supported: same as @p src
+     * @param[in]  lhs_info              LHS matrix information to be used for reshaping. This object contains all the necessary
+     *                                   information to reshape the src tensor. Only the following values are supported:
+     *                                   lhs_info.m0: 2,3,4,5,6,7,8
+     *                                   lhs_info.k0: 2,3,4,8,16
+     *                                   lhs_info.v0: greater than 0
+     *                                   lhs_info.transpose: true, false
+     *                                   lhs_info.interleave: true, false
+     * @param[in]  reinterpret_src_as_3d (Optional) True if the src has to be reinterpreted as 3D tensor
+     */
+    void configure(const ClCompileContext &compile_context, ITensorInfo *src, ITensorInfo *dst, const GEMMLHSMatrixInfo &lhs_info, bool reinterpret_src_as_3d = false);
+    /** Static function to check if given info will lead to a valid configuration
+     *
+     * Similar to @ref ClGemmReshapeLhsMatrixKernel::configure()
+     *
+     * @return a status
+     */
+    static Status validate(const ITensorInfo *src, const ITensorInfo *dst, const GEMMLHSMatrixInfo &lhs_info, bool reinterpret_src_as_3d);
+
+    // Inherited methods overridden:
+    void run_op(ITensorPack &tensors, const Window &window, cl::CommandQueue &queue) override;
+
+private:
+    bool _reinterpret_input_as_3d{ false };
+};
+} // namespace kernels
+} // namespace opencl
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_CL_GEMM_RESHAPE_LHS_MATRIX_KERNEL_H */
\ No newline at end of file