[9] RFR(XS) 8080483: Incorrect test execution string at SumRed_Long.java

[Vladimir Kozlov]

Small typo fix. Test run commands incorrectly execute SumRed_Double 
class instead of SumRed_Long.

http://cr.openjdk.java.net/~kvn/8080483/webrev/
https://bugs.openjdk.java.net/browse/JDK-8080483

Tested with jtreg.

Thanks,
Vladimir