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This PR adds system SVM testing both using driver APIs (`clSVMAllocWithPropertiesKHR`) and the system allocator directly (e.g. `malloc`). This is done by finding all of the SVM capabilities that are "system allocated" and duplicating them with a special "use system allocator" pseudo-capability. When the "use system allocator" pseudo-capability is not present, the system SVM type is treated the same as all other unified SVM types and is tested using driver APIs. When the "use system allocator" pseudo-capability is present, the system SVM type is allocated using the system allocator directly, though this also adds some limitations, for example the properties of the allocation may not be queried using `clGetSVMPointerInfoKHR`. See discussion in: https://github.com/KhronosGroup/OpenCL-Docs/issues/1446