RFR(T): 8223143: Restructure/clean-up for 'loopexit_or_null()'.

[Patric Hedlin]

Dear all,

I would like to ask for help to review the following change/update:

Issue:  https://bugs.openjdk.java.net/browse/JDK-8223143
Webrev: http://cr.openjdk.java.net/~phedlin/tr8223143/

8223143: Restructure/clean-up for 'loopexit_or_null()'.

     Minor restructure and clean-up for 'loopexit_or_null()' and its use.


Testing: Part of 8216137 (hs-tier1..4, hs-precheckin-comp, Kitchensink24h)


Best regards,
Patric