8166804: Convert TestMetachunk_test to GTest
Reviewed-by: iignatyev

8151623: Zap freed Metaspace chunks in non-product binaries
Reviewed-by: stefank, jmasa

8029178: Parallel class loading test anonymous-simple gets SIGSEGV in Metaspace::contains
Summary: Metaspace::contains cannot look at purged metaspaces while CMS concurrently deallocates them.
Reviewed-by: mgerdin, sspitsyn, jmasa

8026707: JDK-8026391 broke the optimized build target
Reviewed-by: mgerdin, coleenp

8026391: The Metachunk header wastes memory
Reviewed-by: coleenp, jmasa

8011268: NPG: Free unused VirtualSpaceNodes
Reviewed-by: mgerdin, coleenp, johnc

8005082: NPG: Add specialized Metachunk sizes for reflection and anonymous classloaders
Reviewed-by: johnc, coleenp

8000662: NPG: nashorn ant clean test262 out-of-memory with Java heap
Summary: Add ClassLoaderData object for each anonymous class with metaspaces to allocate in.
Reviewed-by: twisti, jrose, stefank

7045397: NPG: Add freelists to class loader arenas.
Reviewed-by: coleenp, stefank, jprovino, ohair