RFR: JDK-8281001 Examine the behavior of Class::forName if the caller is null [v4]

[Tim Prinzing]

> The Class::forName behavior change to match JNI FindClass is a compatible change and seems pretty attractive as it would be expected that Class::forName would give the same behavior as FindClass which uses the system classloader.  The test for 8281006 was enhanced to test for this change.  Merged master to pick up fixes to unrelated test failures to reduce noise.

Tim Prinzing has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Fixed the build of the native c++ test NullCallerTest to specify
   the c++ std library as part of the build.  Changed the test to
   use iostream instead of printf.  Enabled the test for Class::forName
   which is now located in test/jdk/jni/nullCaller (as part of the
   merge of JDK-8287171).
 - Merge branch 'master' into JDK-8281001
 - make javadoc consistent with other caller sensitve methods
 - Added javadoc comment
 - Merge branch 'master' into JDK-8281001
 - JDK-8281001 Examine the behavior of Class::forName if the caller is null

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Changes: https://git.openjdk.java.net/jdk/pull/8711/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8711&range=03
  Stats: 19 lines in 5 files changed: 10 ins; 3 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8711.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8711/head:pull/8711

PR: https://git.openjdk.java.net/jdk/pull/8711