RFR: 8072921: -Xincgc should be removed from output

[Stefan Karlsson]

Hi all,

I hope this is the right list for this RFR.
Please review this patch to remove the -Xincgc output from the java 
launcher.

http://cr.openjdk.java.net/~stefank/8072921/webrev.01
https://bugs.openjdk.java.net/browse/JDK-8072921

The output can be seen by running 'java -X':
$ ../build/linux-x86_64-normal-server-release/jdk/bin/java -X
    -Xmixed           mixed mode execution (default)
    -Xint             interpreted mode execution only
    -Xbootclasspath/a:<directories and zip/jar files separated by :>
                      append to end of bootstrap class path
    -Xdiag            show additional diagnostic messages
    -Xdiag:resolver   show resolver diagnostic messages
    -Xnoclassgc       disable class garbage collection
    -Xincgc           enable incremental garbage collection

The -Xincgc flag was removed with JEP 214:
 https://bugs.openjdk.java.net/browse/JDK-8044022
 JEP 214: Remove GC Combinations Deprecated in JDK 8

I've left the locale specific launcher files untouched. Should I update 
them as well?

Thanks,
StefanK