RFR: JDK-8213489: GC/C2 abstraction for Compile::final_graph_reshaping()

[Roman Kennke]

GCs might want to do something to nodes in
Compile::final_graph_reshaping(). Let's put an abstraction in this place.

The way I did it was to put a call into
BSC2::final_graph_reshaping(Compile*, Node*) in front of the huge switch
and let the caller know if the node was handled or not. This is
subsequently checked in the default-branch: if GC handled it, the
asserts are not checked. This should provide the exact same behaviour
that we have now, only better and nicer.

I also took the opportunity and moved the ZGC related parts there to
ZBarrierSetC2.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8213489
Webrev:
http://cr.openjdk.java.net/~rkennke/JDK-8213489/webrev.00/

Testing: hotspot/jtreg:tier1 passes

Thoughts? Reviews?

Roman

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