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>

8132919: Put compiler tests in packages
Reviewed-by: vlivanov, dpochepk
Contributed-by: igor.ignatyev@oracle.com

8078426: mb/jvm/compiler/InterfaceCalls/testAC2 - assert(predicate_proj == 0L) failed: only one predicate entry expected
Summary: split if finds predicates on several incoming paths when unswitched's loops are optimized out
Reviewed-by: kvn