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

[mpolacek at gcc dot gnu.org]

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

--- Comment #9 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
With the conversion to unsigned we're also no longer able to optimize
tree-ssa/tailrecursion-6.c.