Merge

8136421: JEP 243: Java-Level JVM Compiler Interface
Reviewed-by: ihse, alanb, roland, coleenp, iveresov, kvn, kbarrett

8080775: Better argument formatting for assert() and friends
Reviewed-by: kbarrett, pliden

8079093: Remove FakeRttiSupport workaround for gcc -Wtype-limits
Summary: Remove the no longer needed workaround.
Reviewed-by: jmasa, david, simonis

8069016: Add BarrierSet downcast support
Summary: Add FakeRttiSupport utility and use to provide barrier_set_cast.
Reviewed-by: jmasa, sangheki