RFR (XXS): 8244714: G1 young gen sizer allows zero young gen with huge -XX:NewRatio

[Thomas Schatzl]

Hi all,

   can I have reviews for this change that regularizes behavior of the 
young gen sizer?

In particular, if NewRatio is exclusively used for sizing the young gen 
sizer may return 0 for minimum size if NewRatio is huge. This is 
different to all other sizing modes.

There is no particular impact from what I understand from tests as the 
heuristics will force a larger than zero sized eden later if possible.

CR:
https://bugs.openjdk.java.net/browse/JDK-8244714
Webrev:
http://cr.openjdk.java.net/~tschatzl/8244714/webrev/
Testing:
hs-tier1-3

Thanks,
   Thomas