[PATCH] PR tree-optimization/96779 Adding a missing pattern to match.pd

[Navid Rahimi]

Hi GCC community,

This patch will add the missed pattern described in bug 102232 [1] to the match.pd. 

Tree-optimization/96779: Adding new optimization to match.pd:

            * match.pd (-x == x) -> (x == 0): New optimization.
            * gcc.dg/tree-ssa/pr96779.c: testcase for this optimization.
            * gcc.dg/tree-ssa/pr96779-disabled.c: testcase for this optimization when -fwrapv passed.

1) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96779

Best wishes,
Navid.
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