amd/llvm: Reorder LLVM headers

LLVM uses __declspec(restrict) which breaks because Mesa define restrict
as __restrict. Move the LLVM headerse up to dodge the macro.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6180>
1 file changed