RFR: 8281637: Remove unused VerifyOption_G1UseNextMarking

Fri Feb 11 12:15:12 UTC 2022

On Fri, 11 Feb 2022 11:25:56 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

> Please review this change to remove an unused verification option.
> 
> **Summary**
> In G1 there have been three different `VerifyOption` that can be passed to verification to signal how to determine liveness. One of these options, `VerifyOption_G1UseNextMarking`,  has been unused for quite some time and this change removes it. When removing it the `G1CollectedHeap::is_obj_ill(...)` functions are more or less unused, so I removed those as well and inlined the checks in the only place where it is really used `G1CMIsAliveClosure::do_object_b(...)`
> 
> **Testing**
> 
> - [x] Mach5
> - [x] Local verification testing

Marked as reviewed by iwalulya (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7440