[jdk20] RFR: 8298176: remove OpaqueZeroTripGuardPostLoop once main-loop disappears

[Vladimir Kozlov]

On Thu, 22 Dec 2022 11:45:44 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Right, that's the difficult part. I was hoping that we could tag the if with a flag or something. But maybe it's not worth it.

We can create new `class ZeroTripCheckNode : public IfNode` similar to `RangeCheckNode`.

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PR: https://git.openjdk.org/jdk20/pull/65