[Bug tree-optimization/14758] [tree-ssa] another missed forward propagation opportunity

[giovannibajo at libero dot it]

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Bug 14758 depends on bug 14728, which changed state.

Bug 14728 Summary: [tree-ssa] missed jump threading due to casts
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14728

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14758