[AMDGPU] Add missing `__builtin_amdgcn_wavefrontsize` builtin (#80741) Summary: The backend supports the wavefrontsize intrinsic, and suggests that it is tied to a corresponding clang builtin, but it is not actually present. This simply adds it in so it can be used from clang. This attribute likely isn't the best to rely on, but for the `libc` use-case we will need to detect a struct's differing size in a way that will depend on the wavefront size.
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