OpenJDK: Implement JVM_FindClassFromCaller
8015256: Better class accessibility
Summary: Improve protection domain check in forName()

Signed-off-by: Xerxes Rånby <xerxes@gudinna.com>
Merge pull request #360 from xranby/master

Implement JVM_FindClassFromCaller OpenJDK: 8015256: Better class accessibility