Enable Compact Object Headers (JEP 519)

 - sets -XX:+UseCompactObjectHeaders which is supported from JDK 25 and
   later
 - NB sets XX:+IgnoreUnrecognizedVMOptions already which means it will
   be silently ignored on older JDKs
 - (experimental on EOL JDK 24, but it won't enable there without also
   setting the flag to enable experimental options - which we don't do)

tested it on NB since JDK 24 without issues

Author: mbien

nb/ide.launcher/netbeans.conf

@@ -66,7 +66,7 @@ netbeans_default_cachedir="${DEFAULT_CACHEDIR_ROOT}/@@metabuild.RawVersion@@"
 # The automatically selected value can be overridden by specifying -J-Xmx
 # here or on the command line.
 #
-netbeans_default_options="-J-XX:+UseStringDeduplication -J-Xss2m @@metabuild.logcli@@ -J-Djava.lang.Runtime.level=FINE -J--sun-misc-unsafe-memory-access=warn -J-Dguice_custom_class_loading=CHILD -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.application.appearance=system -J-Dsun.java2d.noddraw=true -J-Dsun.java2d.dpiaware=true -J-Dplugin.manager.check.updates=false -J-Dnetbeans.extbrowser.manual_chrome_plugin_install=yes @@metabuild.jms-flags@@ -J-XX:+IgnoreUnrecognizedVMOptions -J-javaagent:\"${BASEDIR}/ide/netbeans-javaagent.jar\""
+netbeans_default_options="-J-XX:+UseStringDeduplication -J-XX:+UseCompactObjectHeaders -J-Xss2m @@metabuild.logcli@@ -J-Djava.lang.Runtime.level=FINE -J--sun-misc-unsafe-memory-access=warn -J-Dguice_custom_class_loading=CHILD -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.application.appearance=system -J-Dsun.java2d.noddraw=true -J-Dsun.java2d.dpiaware=true -J-Dplugin.manager.check.updates=false -J-Dnetbeans.extbrowser.manual_chrome_plugin_install=yes @@metabuild.jms-flags@@ -J-XX:+IgnoreUnrecognizedVMOptions -J-javaagent:\"${BASEDIR}/ide/netbeans-javaagent.jar\""
 
 # Default location of JDK:
 # (set by installer or commented out if launcher should decide)