@Override
	public boolean isPrimary() {
		try (LockHold hold = LockHold.lock(manager.lock.readLock())) {
			return (flags & PRIMARY_MASK) != 0;
		}
	}
Set the primary flag.

The caller must still call {@link #update(DBObjectColumn...)} for {@link #FLAGS_COLUMN}, if
this method returns true.

@return true if the primary flag was modified.
Ghidra/Debug/Framework-TraceModeling/src/main/java/ghidra/trace/database/symbol/DBTraceLabelSymbol.java