8166002: Emulate client build on platforms with reduced virtual address space
Summary: The default VM ergonomics on Windows/x86 (32-bit) are changed to client like.
Reviewed-by: kvn, iveresov

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

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