Reviewed-by: kvn

8055530: assert(_exits.control()->is_top() || !_gvn.type(ret_phi)->empty()) failed: return value must be well defined
Summary: concurrent class loading causes return phi to become top
Reviewed-by: kvn

Reviewed-by: dsamersoff, sspitsyn, sla

Reviewed-by: kvn, coleenp

Reviewed-by: dsamersoff, erikj

8076995: gc/ergonomics/TestDynamicNumberOfGCThreads.java failed with java.lang.RuntimeException: 'new_active_workers' missing from stdout/stderr
Reviewed-by: jmasa, drwhite

Reviewed-by: jmasa, kbarrett, tschatzl

Summary: Adding missing check for valid oop.
Reviewed-by: dcubed
Contributed-by: NShafi Ahmad <shafi.s.ahmad@oracle.com>

Reviewed-by: kvn

Reviewed-by: dcubed, dsamersoff

Reviewed-by: kbarrett, tschatzl

Reviewed-by: kvn

Reviewed-by: kvn, mdoerr

Reviewed-by: dsamersoff, dcubed

Reviewed-by: stuefe, coleenp, roland

Reviewed-by: sspitsyn, coleenp, dcubed

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>