RFR: 8292910: Remove root to oop cast in HeapDumper

[Stefan Karlsson]

On Thu, 25 Aug 2022 10:08:49 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

> Small cleanup to fix an unclean cast. This patch was brought over from the Generational ZGC repository, where we have extra verification code around casts to oops.
> 
> I deduplicated the pointer dumping implementation, instead of adding a third version looking more or less the same.

Thanks for the review!

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PR: https://git.openjdk.org/jdk/pull/10018