[Bug middle-end/66313] Unsafe factorization of a*b+a*c

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66313

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
I'm actually testing a patch that moves all of this to match.pd .... (without
fixing this, that said)