Summary: Fixed Whitebox.deoptimizeMethod() to deoptimize all OSR versions of the method.
Reviewed-by: kvn, iignatyev

Summary: Fixed 'SimpleThresholdPolicy::event' to always perform OSR if an OSR nmethod is available.
Reviewed-by: kvn, iveresov

Reviewed-by: jcoomes

Summary: Implemented the interface in sun.misc.URLClassPath and corresponding JVM_XXX APIs
Reviewed-by: mchung, acorn, jiangli, dholmes

8061983: [TESTBUG] compiler/whitebox/MakeMethodNotCompilableTest.java fails with "must not be in queue"
Summary: Added a method checkNotCompiled(boolean isOsr) to either check if the method is OSR compiled or to check if it is non-OSR compiled.
Reviewed-by: kvn

Summary: Call warmup code from OSR triggering method to make sure no non-OSR compilation is triggered in the loop.
Reviewed-by: kvn

Summary: Move the call to 'waitAndDeoptimize' from the warmup methods to the osr triggering methods to make sure that no non-osr compilation is in the queue after warmup.
Reviewed-by: kvn

Summary: Added code to 'warm up' the methods before triggering OSR compilation by executing them a limited number of times. Like this, the profile information marks the loop exit as taken and we don't add an uncommon trap.
Reviewed-by: kvn, dlong, iignatyev

Summary: fixed order of DeoptReason values declaration so now it matches the order used in jdk9 and the names order in Deoptimization::_trap_reason_name.
Reviewed-by: kvn

Reviewed-by: kvn

8052172: Evacuation failure handling in G1 does not evacuate all objects if -XX:-G1DeferredRSUpdate is set
Summary: Remove -XX:-G1DeferredRSUpdate functionality as it is racy. During evacuation failure handling, threads where evacuation failure handling occurred may try to add remembered sets to regions which remembered sets are currently being scanned. The iterator to handle the remembered set scan does not support addition of entries during scan and so may skip valid references.
Reviewed-by: iveresov, brutisso, mgerdin

Summary: Ergonomics updates flags for number of GC threads
Reviewed-by: tschatzl, jwilhelm
Contributed-by: sangheon.kim@oracle.com