RFR: 8012641: Perf_CreateLong creates perf counter of incorrect type

[Calvin Cheung]

A small fix for fixing the switch statement in perf.cpp.
The case 2 and case 3 were mixed up.

Please review.

webrev: http://cr.openjdk.java.net/~ccheung/8012641/webrev/
bugs.sun.com: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8012641
jbs: https://jbs.oracle.com/bugs/browse/JDK-8012641

Test coverage:
     jprt
     using the fastdebug linux_x64 bundle from jprt, ran a few tests 
under jdk/test/sun/tools/jstat

thanks,
Calvin