Bug ID: JDK-8209889 RedefineStress tests crash

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JDK 11	JDK 12
11.0.2Fixed	12 b15Fixed

vmTestbase/nsk/jvmti/RedefineClasses/StressRedefine/TestDescription.java

#  Internal Error (/scratch/opt/mach5/mesos/work_dir/slaves/c4ee7e63-1ded-4e8c-9581-ce26f27e3af4-S150176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/1a72085d-2fb3-4c17-95fb-f55cfe80d904/runs/d0af250e-7cd1-4b65-81d4-a5fc073dbfa1/workspace/open/src/hotspot/share/runtime/handles.inline.hpp:73), pid=20865, tid=20923
#  assert(((Metadata*)obj)->is_valid()) failed: obj is valid
#

And

vmTestbase/nsk/jvmti/RedefineClasses/StressRedefineWithoutBytecodeCorruption/TestDescription.java	

#
#  Internal Error (/scratch/opt/mach5/mesos/work_dir/slaves/c4ee7e63-1ded-4e8c-9581-ce26f27e3af4-S150176/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/1a72085d-2fb3-4c17-95fb-f55cfe80d904/runs/d0af250e-7cd1-4b65-81d4-a5fc073dbfa1/workspace/open/src/hotspot/share/oops/instanceKlass.cpp:3791), pid=3887, tid=3908
#  assert(method->is_obsolete() || method->is_running_emcp()) failed: emcp method cannot run after emcp bit is cleared
#

Moving purging these out of do_unloading might not be working.

Fix Request This intermittent crash can cause memory to be reclaimed while the memory is in the queue of methods to be compiled. This crash only happens when the method is redefined, which is a small window. The fix is simple; to move the code that the safepoints that leaks the compile task. This code causing the breakage was added in jdk11. The JDK 12 patch does not apply cleanly. There was dead code removed in 12 in the area. Code was tested with mach5 hs-tier1 and 2. Review thread. Last two entries are the jdk11 review. http://mail.openjdk.java.net/pipermail/hotspot-dev/2018-October/034509.html

05-10-2018

Duplicate :	JDK-8212153 - RedefineClasses/StressRedefine/TestDescription.java with exit code 134 on Linux-X64
Relates :	JDK-8198756 - Lazy allocation of compiler threads
Relates :	JDK-8208677 - Move inner metaspace cleaning out of class unloading