RFR (S) 8226831 : Use Objects.equals() when appropriate

[Ivan Gerasimov]

Hello!

null-aware comparison of Objects is widely used, so it's tempting to use 
Objects.equals for that.

Unfortunately, there are concerns w.r.t performance (see JDK-8015417), 
so it seems to better avoid this kind of refactoring in the performance 
critical code.

Please find the webrev with a few places cleaned up (I had more, but 
decided to limit this patch due to the concern mentioned above).

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8226831
WEBREV: http://cr.openjdk.java.net/~igerasim/8226831/00/webrev/

Thanks in advance!

-- 
With kind regards,
Ivan Gerasimov