SVM with Buffer

Could there be a unified interface to use SVM allocated memory or OpenCL Buffers in the same C++ class? The way I see it, current SVM is only usable with the std library via SVMAllocator, it would be much simpler if it was integrated as part of a class similar to cl::Buffer.

Start by reading the existing SVMAllocator and cl::Buffer interfaces in the C++ headers. Compare how SVM-allocated memory and OpenCL Buffers are represented and used, then determine the scope of a unified class interface. Done should be a documented, tested design that supports both allocation types without losing their existing usage patterns.

Written by the indexing model from the issue text.