TestNoWarningLoopStripMiningIterSet is runnable only on VM w/ G1, Shenandoah, Z and Epsilon

TestNoWarningLoopStripMiningIterSet test uses `@requires vm.gc.G1 & vm.gc.Shenandoah & vm.gc.Z & vm.gc.Epsilon` to make sure all GCs in its loop are available. this exlcudes this test from execution on VMs which don't have at least one of the listed GCs.