Improve registering signal handlers in java.lang.Terminator.setup()

[Frank Ding]

Hi guys,
  I found that in java.lang.Terminator, setup() method,
The following code of registering default signal handlers can be improved:
/        try {
            Signal.handle(new Signal("INT"), sh);
            Signal.handle(new Signal("TERM"), sh);
        } catch (IllegalArgumentException e) {
        }/
The revised code is illustrated below:
/        try {
            Signal.handle(new Signal("INT"), sh);
        } catch (IllegalArgumentException e) {
        }
        try {
            Signal.handle(new Signal("TERM"), sh);
        } catch (IllegalArgumentException e) {
        }
/The improved version makes more sense since exception thrown from first 
Signal.handle call does not affect subsequent calls. This is more 
consistent with its original intention.
A patch I made is available @
http://cr.openjdk.java.net/~youdwei/ojdk-430/webrev.00//
/Could anybody please take a look at it?  Thanks in advance/

Best regards,
Frank
/