* tree-vrp.c (test_for_singularity): Extracted from  ...
        (simplify_cond_using_ranges): Attempt to simplify a relational
        test to NE_EXPR.  Dump information when a COND_EXPR is simplified.

        * gcc.dg/tree-ssa/vrp17.c: Update expected output.
        * gcc.dg/tree-ssa/vrp18.c: New test.

From-SVN: r102489