hg: jdk/sandbox: 8215165: Improve -Xlog:class+preview message text

[chris.hegarty at oracle.com]

Changeset: de85ab85fbc7
Author:    hseigel
Date:      2018-12-11 10:29 -0500
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/de85ab85fbc7

8215165: Improve -Xlog:class+preview message text
Summary: Fix up the logging message.
Reviewed-by: acorn, lfoltan

! src/hotspot/share/classfile/classFileParser.cpp
! test/hotspot/jtreg/runtime/ClassFile/PreviewVersion.java