[Bug tree-optimization/126486] codesize regression by 17.5% for spec2017 507.catcuBSSN_r caused by r15-6657 with O2

[liuhongt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126486

--- Comment #5 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
The canonicalization in r15-6657 fold signed integer operation into unsigned,
overflow for signed integer is UD, and can be simplied in tree-affine, but the
later one can't, add -fwrapv can also reproduce the issue without r15-6657.