RFR 8223593 : Refactor code for reallocating storage

[Ivan Gerasimov]

Hello!

Jdk has several places with similar logic:  an array needs to be 
reallocated (by at least some defined amount), taking into account the 
maximum allowed size of arrays.

There's clearly an opportunity for refactoring, so it is proposed to 
introduce a dedicated utility method for calculating the best new size 
of an array.

Would you please help review this enhancement?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8223593
WEBREV: http://cr.openjdk.java.net/~igerasim/8223593/00/webrev/

Mach5 job ran fine.

Thanks in advance!

-- 
With kind regards,
Ivan Gerasimov