[SYCL][ROCm] memsetBufferFill for patterns greater than 4 bytes #4252
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Adds case for applying greater than 4 byte patterns to memory buffer.
First applies 4 byte memset pass and follows up with strided 2D memset passes for the remaining pattern segments.
The first initial 4 byte pass provides a computational speed up of between 21%-49% depending on the buffer and pattern size, compared to just using the strided 2D memset for all pattern segments.