RFR 8214719: Deprecate -Xverify:none option

[Aleksey Shipilev]

On 2/6/19 3:18 PM, Harold Seigel wrote:
> Please review this change to deprecate the -Xverify:none and -noverify options in JDK-13.  The
> following warning message will be issued when these options are used:
> 
> Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8214719/webrev/index.html
> JBS Bug:  https://bugs.openjdk.java.net/browse/JDK-8214719 

I am against removing this option: it is used to skip verification overhead on known-good class
files, and also is used to see if verifier _is_ indeed the performance problem for those cases. I
see David Holmes made similar comment in the bug, which was left unacknowledged.

-Aleksey