RFR(10)(XS) 8177015: STACK_SIZE_MINIMUM of 32k is not always enough for Mac OS X

[Chris Plummer]

Hello,

Please review changes for the following:

http://cr.openjdk.java.net/~cjplummer/8177015/webrev.00/
https://bugs.openjdk.java.net/browse/JDK-8177015

The CR description explains the problem. I'm increasing the minimum 
allowed -Xss stack size from 32k to 64k. There are also a couple of 
tests that were testing for -Xss32k that I updated to 64k. I also added 
a new test case for 253k. This is something I intended to do for 
JDK-8176768, but forgot to include the change in the review. It's not 
really related to this CR, but I figured I'd drop it in since I'm making 
other changes to the file.

thanks,

Chris