RFR 8140284: Deprecate -XX:+UnsyncloadClass and -XX:+MustCallLoadClassInternal

[harold seigel]

Hi,

Please review this small JDK-10 change to deprecate the 
-XX:+UnsyncloadClass and -XX:+MustCallLoadClassInternal options. Now, 
when JDK-10 users specify these options they will see the following 
messages:

    Java HotSpot(TM) 64-Bit Server VM warning: Option UnsyncloadClass
    was deprecated in version 10.0 and will likely be removed in a
    future release.

    Java HotSpot(TM) 64-Bit Server VM warning: Option
    MustCallLoadClassInternal was deprecated in version 10.0 and will
    likely be removed in a future release.

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/bug_8140284/webrev/index.html

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8140284

The change was tested with the JTreg hotspot, java/io, java/lang, 
java/util and other JTReg tests, and with JPRT.

Thanks, Harold