[lworld] RFR: 8374882: [lworld] Update hierarchies in oopsHierarchy.hpp

[Joel Sikström]

On Fri, 9 Jan 2026 10:27:39 GMT, Joel Sikström <jsikstro at openjdk.org> wrote:

> Hello,
> 
> The hierarchies in oopsHierarchy.hpp are not up to date with the actual class hierarchies in the implementation. I've refered to these a couple of times and stumble on the fact that they are not accurate.
> 
> I've tested that this builds locally.

I've ran Oracle's tier 1-4, hotspot_valhalla and jdk_valhalla with `refArrayOop` inheriting from `objArrayOop` instead, which looks good. As it is a simple "switch", I'll go ahead and do that in this PR. I also made some spelling fixes to the description of `refArrayOop`.

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PR Comment: https://git.openjdk.org/valhalla/pull/1874#issuecomment-3737341753