OpenCL extensions handling

[Benyei, Guy]

Hi all,
I need an option to generate metadata including the list of OpenCL extensions that were used during compilation. The current extension handling mechanism is implemented in the Sema, so it's not accessible in CodeGen.
Also, I'd like to create an infrastructure for OpenCL extensions that would enable us to define which extensions are supported for a given target.
To make this possible, I used the ASTContext.

Please review.

Thanks
[email_signature_guy_new2]

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