[Clang] Introduce __builtin_meow_synthesises_from_spaceship (#155612) This set of builtins makes it possible to detect whether a comparison operation is synthesised from a spaceship operator. This makes it possible to avoid calling the comparison multiple times if you care about the three-way relation. This is especially interesting for the associative containers from the STL, since a lot of functions call the comparator twice to establish the relation. With this builtin these functions can call the comparator just once and use the result of the three way comparison directly.
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