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

8158412: [TESTBUG] TestIHOPErgo and TestStressG1Humongous should not be executed when JFR is enabled
Reviewed-by: dfazunen, tschatzl

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

8148397: Create new tests for IHOP
Reviewed-by: tschatzl, dfazunen