8151280: update hotspot tests to use vm.compMode instead of their own logic
Summary: Update hs compiler tests to use vm.compMode instead of their own logic and to get VM mode using j.t.l.Platform
Reviewed-by: kvn, dpochepk
Contributed-by: igor.ignatyev@oracle.com

8132919: Put compiler tests in packages
Reviewed-by: vlivanov, dpochepk
Contributed-by: igor.ignatyev@oracle.com

8006960: hotspot, "impossible" assertion failure
Summary: Escape state of allocated object should be always adjusted after it was passed to a method.
Reviewed-by: kvn