RFC: C2 LRB self-fixup for testing to sh/jdk

[Aleksey Shipilev]

Hi,

I want to push these patches to sh/jdk for testing:
  http://cr.openjdk.java.net/~shade/8225357/webrev.01/
  http://cr.openjdk.java.net/~shade/8225441/webrev.01/
  http://cr.openjdk.java.net/~shade/shenandoah/lrb-sfx.patch

This is the bulk change I am going to push:
  http://cr.openjdk.java.net/~shade/shenandoah/lrb-c2-fixup/webrev.01/

Testing: hotspot_gc_shenandoah

-- 
Thanks,
-Aleksey