RFR: 8254573: Shenandoah: Streamline/inline native-LRB entry point

[Aleksey Shipilev]

On Mon, 12 Oct 2020 10:45:28 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> We currently do several calls between the native-LRB entry point and the actual implementation, presumably to resolve
> the templated versions. This can be simplified.
> Testing: hotspot_gc_shenandoah

This looks fine. I think it was this way because JRT_LEAF had opinions about templated methods. But I see there is the
same thing happens for `SBS::load_reference_barrier_mutator`, so it should be fine.

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Marked as reviewed by shade (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/604