[OpenCL] __generic address space for CL2.0

[Anastasia Stulova]

Hi Sameer,

Thanks for your comments. Attaching an updated patch here.

> Variables declared in the local address space can only occur at kernel function scope. Only pointers to local address space can be declared in other places. I am not sure if a pointer to local address space can be declared at program scope. It doesn't sound very useful, but can't confirm if the spec disallows it.

I think pointers to local address space don't make any sense in program scope, although spec doesn't really say it explicitly. I will see if this bit can be clarified with Khronos. Could we proceed with this patch nevertheless? I can commit an update later if changes in the spec happen. 

Regards,
Anastasia
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