RFR: JDK-8281000 ClassLoader::registerAsParallelCapable throws NPE if caller is null [v2]

[Tim Prinzing]

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

Tim Prinzing has updated the pull request incrementally with one additional commit since the last revision:

  Changes from feedback.
  
  - Copyright dates fixed
  - IllegalCallerException thrown for no caller frame, and associated
  javadoc changes
  - test changed to look for IllegalCallerException thrown.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7448/files
  - new: https://git.openjdk.java.net/jdk/pull/7448/files/c6d37069..fa66af15

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7448&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7448&range=00-01

  Stats: 33 lines in 3 files changed: 22 ins; 2 del; 9 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