Request for review JDK-8183973 - gc/TestFullGCALot.java fails in JDK10-hs nightly

[Alexander Harlap]

Please review change for JDK-8183973 
<https://bugs.openjdk.java.net/browse/JDK-8183973> - 
gc/TestFullGCALot.java fails in JDK10-hs nightly

Proposed change is located at 
http://cr.openjdk.java.net/~aharlap/8183973/webrev.00/

Change is to avoid failure failure due to insufficient NewSize while 
running test with UseDeterministicG1GC option.

Changed is suggested by Erik Helin.

I reproduced failure on machine where nightly failure happened. 
Suggested change eliminated failure.

Thank you,

Alex