* 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
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