A new test tools/javac/flags/ExtendedStandardFlagsOverlayFlagsConflict.java came in with merge of jdk-26+6 (JDK-8361570), and it fails:

java.lang.AssertionError: Flag: 1048576 has more than one flag field: [public static final int com.sun.tools.javac.code.Flags.BLOCK, public static final int com.sun.tools.javac.code.Flags.VALUE_CLASS]
at ExtendedStandardFlagsOverlayFlagsConflict.run(ExtendedStandardFlagsOverlayFlagsConflict.java:76)