[Bug tree-optimization/20115] [4.0 Regression] Pure functions are mishandled

[pinskia at gcc dot gnu dot org]

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           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[4.0 Regression] Pure       |[4.0 Regression] Pure
                   |functions are missed handled|functions are mishandled


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20115