https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70452
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- Hashtable lookups are from location/block remapping done. I _think_ that if all the copy_body stuff we do for constexpr evaluation would just "drop" locations for the copy we'd still be fine constexpr wise but would save quite a lot of linemap overhead and compile-time (hash-table lookup for combined locs via set_block for example). So maybe add a new field to copy_body_data for this purpose.
