This addresses interactions between parallelism-0 and new shutdown support in https://bugs.openjdk.java.net/browse/JDK-8259800
------------- Commit messages: - JDK-8259800 Changes: https://git.openjdk.java.net/jdk/pull/2661/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2661&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8259800 Stats: 347 lines in 2 files changed: 175 ins; 106 del; 66 mod Patch: https://git.openjdk.java.net/jdk/pull/2661.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/2661/head:pull/2661 PR: https://git.openjdk.java.net/jdk/pull/2661
