RFR(S)[12] : 8215322 : add @file support to jaotc

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8215322/webrev.00
> 33 lines changed: 30 ins; 2 del; 1 mod;

Hi all,

could you please review this patch for jatoc tool?

from the bug:
currently, the number of jaotc argument is limited by max command line length, in some cases, it isn't enough, for example compiling a number of selected classes. many java tools have support for '@file' so adding the same support to jaotc is natural and will solve the problem w/ limitation.

I've requested approval per 'Late-Enhancement Request Process' from JEP 3 and will integrate it iif the approval is provided.

webrev: http://cr.openjdk.java.net/~iignatyev//8215322/webrev.00
JBS: https://bugs.openjdk.java.net/browse/JDK-8215322
testing: tier[1-2],hs-tier3-graal

Thanks,
-- Igor