RFR (XXS): 8218680: G1 crashes during calculation of old collection set candidates

[Thomas Schatzl]

Hi all,

  can I have reviews for this one-liner fix caused by passing
parameters in the wrong order to some internal data structure during
calculation of old collection set candidates?

CR:
https://bugs.openjdk.java.net/browse/JDK-8218680
Webrev:
http://cr.openjdk.java.net/~tschatzl/8218680/webrev
Testing:
The very quickly (<1min, right the first time it calculates old
collection set candidates) crashing application, BigRAMTester, now runs
more than 30mins.

Thanks,
  Thomas