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>

8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder
Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff

8160088: update hotspot tests depending on GC to use @requires vm.gc.X
Reviewed-by: iignatyev, mchernov, dholmes

8154258: [TESTBUG] Various serviceability tests fail compilation
Summary: Replace sun.misc.Unsafe with jdk.internal.misc.Unsafe
Reviewed-by: chegar, kvn

8134995: [REDO] GC: implement ranges (optionally constraints) for those flags that have them missing
Summary: Add ranges and constraint functions for GC flags.
Reviewed-by: kbarrett, jmasa, jwilhelm, gziemski, zmajo

8134972: [BACKOUT] GC: implement ranges (optionally constraints) for those flags that have them missing
Reviewed-by: jwilhelm

8078555: GC: implement ranges (optionally constraints) for those flags that have them missing
Summary: Add ranges and constraint functions for GC flags.
Reviewed-by: jmasa, kbarrett, gziemski, ddmitriev, drwhite

8042901: Allow com.sun.management to be in a different module to java.lang.management
Reviewed-by: mchung, dfuchs, erikj, jbachorik

8075586: Add @modules as needed to the open hotspot tests
Reviewed-by: sla, ctornqvi, lfoltan, mchung, alanb
Contributed-by: alexander.kulyakhtin@oracle.com

8065749: [TESTBUG]: gc/arguments/TestG1HeapRegionSize.java fails at nightly
Reviewed-by: brutisso

8062537: [TESTBUG] Conflicting GC combinations in hotspot tests
Reviewed-by: brutisso

8021879: G1: G1HeapRegionSize flag value not updated correctly
Reviewed-by: tschatzl, jmasa