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

8149123: [TESTBUG] compiler/loopopts/superword/SumRed* tests running on non-x86 platforms
Summary: Restricted test execution to supported archs.
Reviewed-by: kvn
Contributed-by: Jamsheed Mohammed <jamsheed.c.m@oracle.com>

8078563: Restrict reduction optimization
Reviewed-by: kvn, twisti
Contributed-by: michael.c.berg@intel.com