bad reassociation with signed integer code after PR45232.

[Dinar Temirbulatov]

Hi,
I noticed some minor regression with singed integer operations in "the
proprietary" code since
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45232. Of course, I could
use "-fwrapv"  flag but my question is: why we could not add overflow
checking in for example int_const_binop() at fold-const.c for signed
integers restore original behavior of the reassociation pass?
                                                              thanks, Dinar.