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

[phython at gcc dot gnu dot org]

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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|REOPENED                    |RESOLVED
         Resolution|                            |FIXED

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