Mark Assertion Predicates useless instead of replacing them by a constant directly

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      We currently directly replace a useless Assertion Predicate with a constant to let it fold during IGVN. This messes with Assertion Predicate matching (see, for example, JDK-8350637). We should mark the opaque nodes of useless Assertion Predicates and then clean them up during IGVN to not interfere the predicate matching code.

            Assignee:
            Christian Hagedorn
            Reporter:
            Christian Hagedorn
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