RFR(s): 8152176: Big ParGCCardsPerStrideChunk values can cause overflow for CMS GC

[sangheon]

Hi all,

Could I have some reviews for this change?

As very large value of ParGCCardsPerStrideChunk flag would result in an 
overflow, we need a constraint function after memory initialization. And 
the function will check the flag to be less than of equal to the size of 
card table and not to make an overflow with other stride 
factors(ParallelGCThreads and ParGCStridesPerThread).

CR: https://bugs.openjdk.java.net/browse/JDK-8152176
Webrev: http://cr.openjdk.java.net/~sangheki/8152176/webrev.00
Testing: JPRT, all runtime/commandline JTREG tests on all platforms

Thanks,
Sangheon