mesa: Detect and provide macros for function attributes pure and const.
These are really useful hints to the compiler in the absence of link-time optimization, and I'm going to use them in VC4. I've made the const attribute be ATTRIBUTE_CONST unlike other function attributes, because we have other things in the tree #defining CONST for their own unrelated purposes. v2: Alphabetize. Reviewed-by: Kenneth Graunke <firstname.lastname@example.org> (v1)
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