RFR: 8268635: Corrupt oop in ClassLoaderData

[Coleen Phillimore]

We worked on writing a test for this but weren't successful.  Based on analysis by @stefank this missing call may have been the cause of the crash.
Tested with tier1-3.

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Commit messages:
 - 8268635: Corrupt oop in ClassLoaderData

Changes: https://git.openjdk.java.net/jdk/pull/4701/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4701&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268635
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4701.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4701/head:pull/4701

PR: https://git.openjdk.java.net/jdk/pull/4701