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This PR adds tests for a number of interesting unified SVM corner cases. Not all of these may be valid tests! If we decide that some of these tests are invalid, I will remove them. Added tests include: * Calling clSVMAllocWithPropertiesKHR to allocate zero bytes for each unified SVM type. * Calling clSVMFreeWithPropertiesKHR to free a NULL pointer. * Calling clEnqueueSVMFree to asynchronously free an empty set of SVM pointers. * Calling clEnqueueSVMFree to asynchronously free a NULL pointer. * Calling clSetKernelArgSVMPointer to set a NULL pointer kernel argument. * Calling clSetKernelArgSVMPointer to set a bogus pointer kernel argument. * Calling clSetKernelExecInfo with CL_KERNEL_EXEC_INFO_SVM_PTRS with an empty set of SVM pointers. * Calling clSetKernelExecInfo with CL_KERNEL_EXEC_INFO_SVM_PTRS with a NULL pointer. * Calling clSetKernelExecInfo with CL_KERNEL_EXEC_INFO_SVM_PTRS with a bogus pointer. * Calling clEnqueueSVMMemcpy with a size of zero and a NULL source or destination pointer. * Calling clEnqueueSVMMemcpy with a size of zero and a bogus source or destination pointer. * Calling clEnqueueSVMMemcpy with a size of zero and a valid source or destination pointer. * Calling clEnqueueSVMMemFill with a size of zero and a NULL destination pointer. * Calling clEnqueueSVMMemFill with a size of zero and a bogus destination pointer. * Calling clEnqueueSVMMemFill with a size of zero and a valid destination pointer. * Calling clEnqueueSVMMigrateMem with a size of zero and a NULL pointer. * Calling clEnqueueSVMMigrateMem with a size of zero and a valid pointer.