hg: jdk/jdk: 8242237: Improve JVM TI HiddenClasses tests

[serguei.spitsyn at oracle.com]

Changeset: cb30ac97cc14
Author:    sspitsyn
Date:      2020-04-28 02:37 +0000
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/cb30ac97cc14

8242237: Improve JVM TI HiddenClasses tests
Summary: Improve JVM TI HiddenClasses test: cleanup + more comments
Reviewed-by: lmesnik, amenkov

! test/hotspot/jtreg/serviceability/jvmti/HiddenClass/P/Q/HiddenClassSigTest.java
! test/hotspot/jtreg/serviceability/jvmti/HiddenClass/libHiddenClassSigTest.cpp