8218941: jdb should support a dbgtrace command that acts the same as the dbgtrace command line option Summary: added dbgtrace command. Reviewed-by: sspitsyn, amenkov, gadams

8215249: Miscellaneous changes imported from jsr166 CVS 2019-02 Reviewed-by: martin, chegar, dholmes

8215363: needless signals in ForkJoinPool Reviewed-by: martin, chegar, dholmes

8215359: InnocuousForkJoinWorkerThread.setContextClassLoader needlessly throws Reviewed-by: martin, chegar, dholmes, reinhapa, alanb

8195057: java/util/concurrent/CountDownLatch/Basic.java failed w/ Xcomp Reviewed-by: martin, chegar, dholmes

8219006: AArch64: Register corruption in slow subtype check Reviewed-by: adinn

8218851: JVM crash in custom classloader stress test, JDK 12 & 13 Summary: Handle NULL and unloaded constraint class in loader constraint table, also cope with unloaded but not cleaned out klass in loader constraint entries. Reviewed-by: hseigel, huntch, stuefe

8203469: Faster safepoints Reviewed-by: dcubed, pchilanomate, dholmes, acorn, coleenp, eosterlund

8079353: [TESTBUG] runtime/CompressedOops/UseCompressedOops.java failed on Windows when getting disjoint instead of zero based coops Summary: On Windows, don't run sub-tests that can be affected by ASLR. Reviewed-by: coleenp, mseledtsov

8217381: Incovenient errors reported when annotation processor generates source file and errors in the same round Summary: When an annotation processor reports and error, defer reporting recoverable errors from the erroneous round to the last round, to avoid reporting errors that were resolved in the erroneous round. Reviewed-by: jjg