add support for common extensions #21
Merged
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Description of Changes
Some new extensions like the new loader info extension are common extensions, not tied to any specific platform. They should be queried using clGetExtensionFunctionAddress, not the per-platform clGetExtensionFunctionAddressForPlatform, and they can use a single global dispatch table rather than a per-platform dispatch table.
Testing Done
Added unit tests, also tested via a basic tester app.