[Bug tree-optimization/18487] Warnings for pure and const functions that are not actually pure or const

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=18487

--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think I agree with closing this as won't fix as shown now we have three
duplicated bugs asking the same thing.