OpenCL C "long" should always have 64 bits

[David Tweed]

Hi,

| The address space map IMO should not be imposed, because it represents how a
| given OpenCL address space should be mapped to target address space that the
| target backend is able to handle.

I think that the view on how to represent OpenCL address spaces (front-end vs back-end) has changed since I first posted my patch, and I agree this is now inappropriate to hardwire what's now a backend value for all targets.

Cheers,
Dave

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