RFR 8184289: Obsolete -XX:+UnsyncloadClass and -XX:+MustCallLoadClassInternal options

[harold seigel]

Hi,

Please review this JDK-11 change to obsolete the UnsyncloadClass and 
MustCallLoadClassInternal options.  With this change, these options are 
still accepted on the command line but have no affect other than to 
generate these warning messages:

    Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option
    UnsyncloadClass; support was removed in 11.0

    Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option
    MustCallLoadClassInternal; support was removed in 11.0

Open Webrev: 
http://cr.openjdk.java.net/~hseigel/bug_8184289/webrev/index.html

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8184289

The change was tested with Mach5 tiers 1-5 and the NSK parallel class 
loading tests.  Also, JDK's containing the change were built on all 
Mach5 platforms.

Thanks, Harold