[OpenCL] change default address space of pointers in CL2.0 mode

[Anastasia Stulova]

Hello,

 

This patch mainly implement the following requirement from OpenCLv2.0 C spec
s6.5:

 

"Pointers that are declared without pointing to a named address space point
to the generic address space."

 

Note,  that a named address space is any of those that existed in the
previous standards, i. e. __global, __local,  __private, or __constant.

This patch depends on the change submitted previously:

https://www.mail-archive.com/cfe-commits@cs.uiuc.edu/msg109232.html

 

Thanks,

Anastasia
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