[lworld] Disable PhaseIdealLoop::try_sink_out_of_loop until optimization is stable in mainline

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      There are known (mainline) issues with JDK-8252372 (see JDK-8271954, JDK-8272562) that seem to manifest in Valhalla. Disable the optimization until it's stable in mainline.

            Assignee:
            Tobias Hartmann
            Reporter:
            Tobias Hartmann
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