8165687: Fix license and copyright headers in jd9 under hotspot/test
Summary: Legal notices and Oracle copyrights were updated (white and blank space, commas) in tests files for uniformity to meet Oracle requirements.
Reviewed-by: dholmes, iris
Contributed-by: Stanislav Smirnov <stanislav.smirnov@oracle.com>, Vassili Igouchkine <vassili.igouchkine@oracle.com>

8139164: JVM should throw ClassFormatError for non-void methods named <clinit>
Summary: If method being parsed is named <clinit>, throw ClassFormatError if it is not void or has arguments, for class file version >= 51.
Reviewed-by: acorn, lfoltan

8130669: VM prohibits <clinit> methods with return values
Summary: Ignore <clinit> methods with return values instead of throwing ClassFormatError exceptions
Reviewed-by: acorn, iklam