RFR (M): 8019489: Add regression test for JDK-8000232

[Filipp Zhinkin]

Hi,

I would like to add regression test for 8000232: NPG: SIGSEGV in
Dependencies::DepStream::check_klass_dependency on solaris-x64.

Original issue occurs when dependency became invalid during compilation
and HS tries to write dependency to compilation log.
In order to reproduce it my test force creation of unique concrete method
dependency and tries to invalidate it during compilation.

At first test loads two classes: ContextClass and SubtypeClass, such that
ContextClass has method "m" and SubtypeClass extends ContextClass without
overriding that method. After that method "m" is repeatedly invoked on
instance of ContextClass until amount of invocations will not be equal to
CompilationThreshold-1. When method "m" invoked CompilationThreshold-1
times test loads class WitnessClass that extends ContextClass and override
method "m" in separate thread and continue invocations of "m" on instance
of ContextClass. WitnessClass will make unique concrete method dependency
invalid and if issue described in 8000232exist JVM will crash.

webrev: http://cr.openjdk.java.net/~vlivanov/filipp/8019489/

I've run JPRT to check that there are no issues with test and it passed.

Thanks,
Filipp.