8177741: Fix hotspot tests to use --patch-module instead of -Xmodule
Summary: Change InMemoryJavaCompiler.compile() to accept --patch-module instead of -Xmodule, and then change appropriate tests.
Reviewed-by: coleenp, gtriantafill

8180037: move jdk.test.lib.InMemoryJavaCompiler to a separate package
Reviewed-by: mseledtsov, vlivanov

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

8136930: Simplify use of module-system options by custom launchers
Reviewed-by: coleenp, lfoltan, mchung