RFR: 8227677: Shenandoah: C2: Make in-native LRB special case of normal LRB

[Roman Kennke]

I spotted a leftover string rename:

Incremental:
http://cr.openjdk.java.net/~rkennke/JDK-8227677/webrev.01.diff/
Full:
http://cr.openjdk.java.net/~rkennke/JDK-8227677/webrev.01/

Roman


> Currently, IN_NATIVE LRB generates a runtime call during parsing in C2.
> This may break optimizations. It is known to break the
> mirror->Klass*->mirror / Klass*->mirror->Klass* optimizations, and
> possibly some others too (e.g. wholesale elimination of the barrier on
> new/constant objects).
> 
> It seems better to emit the normal LoadReferenceBarrier, with a special
> property 'native' instead, and only generate different
> runtime-call-addresses.
> 
> The patch reverts the other C2 parts that I pushed for IN_NATIVE support.
> 
> Bug:
> https://bugs.openjdk.java.net/browse/JDK-8227677
> Webrev:
> http://cr.openjdk.java.net/~rkennke/JDK-8227677/webrev.00/
> 
> Testing: hotspot_gc_shenandoah, ctw-tests
> 
> Ok?
> 
> Roman
>