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

8157954: [TESTBUG] G1 tests fail with defined MaxGCPauseMillis
Reviewed-by: jmasa, dfazunen, tschatzl

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

8153222: [TESTBUG] Move tests in stress/gc to gc/stress
Reviewed-by: dfazunen, jwilhelm