[Bug middle-end/61893] Constant folding inhibits trapping with -ftrapv

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61893

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note only the non-constant-folding part is fixed (the REG_EQUAL notes which
enable combine to remove the trapping).