Reviewed-by: tschatzl, mchernov

Reviewed-by: coleenp, dholmes, sla

Summary: Implement remembered sets verification for G1 with option VerifyRememberedSets
Reviewed-by: jmasa, mgerdin

Summary: Ignore OOM in the test
Reviewed-by: kvn

Summary: Emit CastII to make narrow ConvI2L dependent on the corresponding range check.
Reviewed-by: kvn, roland

Summary: Do not make reused PRTs available to other threads before the bitmap of the PRT has been cleared.
Reviewed-by: tbenson, mgerdin, brutisso
Contributed-by: NPoonam Bajaj &lt;poonam.bajaj@oracle.com&gt;, Thomas Schatzl <thomas.schatzl@oracle.com>

8139424: SIGSEGV, Problematic frame: # V [libjvm.so+0xd0c0cc] void InstanceKlass::oop_oop_iterate_oop_maps_specialized<true,oopDesc*,MarkAndPushClosure>
Summary: The crash was caused by a faulty eager humongous reclaim. The reason for reclaiming a live object was that the call to cleanupHRRS was done after dirtying cards and clearing the remembered sets for the humongous object. This could lead to one or many cards being missed.
Reviewed-by: tbenson, kbarrett, tschatzl

Summary: Improve the thread and threads commands in CLHSDB
Reviewed-by: dsamersoff