RFR: 8298301: C2: assert(main_cmp->in(2)->Opcode() == Op_Opaque1) failed: main loop has no opaque node?

[Vladimir Kozlov]

On Wed, 7 Dec 2022 17:03:08 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

> This starts to show up in our CI in various tests after [JDK-8269820](https://bugs.openjdk.org/browse/JDK-8269820) which added a new `OpaqueZeroTripGuardNode` but forgot to update an assert which still checks for `Opaque1` instead of `OpaqueZeroTripGuard`. I've fixed that with this patch.
> 
> Currently running tests:
> - tier1-4
> 
> Thanks,
> Christian

Looks good.
One more reason to rename all Opaque nodes and find places where they are used.

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PR: https://git.openjdk.org/jdk/pull/11567