RFR(s): 8144527: NewSizeThreadIncrease would make an overflow

[Michail Chernov]

Hi Shangheon,

Could you please fix @requires tag. Should be: @requires vm.gc=="Serial" 
| vm.gc=="null"

Also @requires tag should be placed with other tag in one /*..*/ 
comment, otherwise it doesn't work, see 
http://openjdk.java.net/jtreg/tag-spec.html#LEADING_COMMENTS .

Thanks
Michail

>>
> Okay.
>
> To make sure, I'm posting next webrev which includes Mikael's comment.
>
> Webrev: http://cr.openjdk.java.net/~sangheki/8144527/webrev.02
> Testing: JPRT
>
> Thanks,
> Sangheon