RFR+RFA [11u] 8214827: Incorrect call ClassLoaders.toFileURL("jrt:/java.compiler")

[Aleksey Shipilev]

Please review and approve the backport to 11u:

  Original Bug:
      URL: https://bugs.openjdk.java.net/browse/JDK-8214827
      Reporter: Martin Buchholz
      Assignee: Jiangli Zhou
      Priority: P3
      Components: hotspot

  Original Fix:
        12: JDK-8214827, http://hg.openjdk.java.net/jdk/jdk12/rev/fbab5d82f3d7, 40 day(s) ago

  Backports and Forwardports:
        13: 13, JDK-8216526, http://hg.openjdk.java.net/jdk/jdk/rev/fbab5d82f3d7, 40 day(s) ago
        11: MISSING
         8: Not affected


The patch does not apply cleanly to 11u, because it conflicts with non-backported cleanup change
(JDK-8207211) in test/hotspot/jtreg/runtime/appcds/test-classes/ProtDomain.java. Manual merge in
that test was needed.

The resulting 11u webrev:
  http://cr.openjdk.java.net/~shade/8214827/webrev.11u.01/

Testing: new test, entire runtime/appcds suite; verified new regression test fails without patch

Thanks,
-Aleksey