RFR: 8133873: Simplify {Register, Unregister}NMethodOopClosure [v2]

[Albert Mingkun Yang]

On Wed, 30 Jun 2021 13:41:27 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

>> Simple change of excluding compressed oops in nmethod closures.
>
> Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   restore assert

Thanks for the review.

-------------

PR: https://git.openjdk.java.net/jdk/pull/4632