Improve compiler generated name for base class for SPIR kernel argument

[elizabethandrews]

When working on test I realized compiler generated name can be improved for base classes as well. At the moment, they all have same name _arg__base. I will work on it as a follow-up PR.

Originally posted by @elizabethandrews in https://github.com/intel/llvm/issues/5819#issuecomment-1068577208

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