RFR: 8015686 : (XS) {Int|Long}SummaryStatistics toString() throws IllegalFormatConversionException

[Mike Duigou]

Hello all;

A very small review for a change which was fixed in the lambda repo (JDK-8012691) but escaped into TL:

http://cr.openjdk.java.net/~mduigou/JDK-8015686/0/webrev/

Mike