RFR: 8256740: ZGC: Move closures out of zOopClosure files

[Per Liden]

On Fri, 20 Nov 2020 12:39:35 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> zOopClosures.hpp and zOopClosures.inline.hpp contain a collection of different closures. There used to be a need to split closures and have them registered with the oop iterate framework, but that has been fixed with the last oop iterate framework rewrite.
> 
> I propose that we move the closures out to the sub-systems where they are used.

Looks good!

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Marked as reviewed by pliden (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1347