[Bug tree-optimization/20130] Fold a * -1 - 1 into ~a;

[pinskia at gcc dot gnu dot org]

-- 
Bug 20130 depends on bug 15784, which changed state.

Bug 15784 Summary: fold misses binary optimization
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15784

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20130