RFR: JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null

[Tim Prinzing]

JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null

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Commit messages:
 - Merge branch 'master' into JDK-8281000
 - JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null

Changes: https://git.openjdk.java.net/jdk/pull/7448/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7448&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281000
  Stats: 140 lines in 4 files changed: 139 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7448.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7448/head:pull/7448

PR: https://git.openjdk.java.net/jdk/pull/7448