RFR(S/M) : 8242310 : use reproducible random in hotspot compiler tests

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev//8242310/webrev.00
> 282 lines changed: 123 ins; 24 del; 135 mod; 

Hi all,

could you please review the patch which marks hotspot compiler tests w/ randomness k/w and uses Utils.getRandomInstance() instead of Random w/ _random_ seeds where possible? To identify tests which should be marked, I've used both static (in a form of analyzing classes which directly or indirectly depend on Random/SecureRandom/ThreadLocalRandom) and dynamic (by instrumenting the said classes to log tests which called their 'next' methods) analyses. I've decided *not* to mark tests which use SecureRandom only via File.createTemp* b/c in all such cases temp files are not used as a source of randomness, but rather just a reliable way to get a new/empty file/dir.

the patch also 
 - replaces fixed seed w/ 42 (in the tests which don't really depend on a seed value) as it's most common fixed seed in hotspot test suite;
 - moves Utils.getRandomInstance() calls closer to usage, so 'To re-run test with same seed value please add ... ' won't be printed out by the tests which don't actually use random but use share classes which might use random.

webrevs: for the sake of reviewers, I've split the patch into parts, webrev.code.00 has only changes in the code, webrev.kw.00 -- only adds the k/w (and comments in few places where one might think k/w is needed), and webrev.00 contains all changes (including copyright year updates) 
http://cr.openjdk.java.net/~iignatyev//8242310/webrev.code.00
> 109 lines changed: 41 ins; 24 del; 44 mod;
http://cr.openjdk.java.net/~iignatyev//8242310/webrev.kw.00
> 84 lines changed: 82 ins; 0 del; 2 mod; 
http://cr.openjdk.java.net/~iignatyev//8242310/webrev.00
> 282 lines changed: 123 ins; 24 del; 135 mod; 

NB the patch depends on 8241707[1], which is currently under review[2].

testing: test/hotspot/jtreg/compiler tests on {linux,windows,macosx}-x64
JBS: https://bugs.openjdk.java.net/browse/JDK-8242310

[1] https://bugs.openjdk.java.net/browse/JDK-8241707
[2] https://mail.openjdk.java.net/pipermail/hotspot-dev/2020-April/041300.html

Thanks,
-- Igor