RFR: 8301047: Clean up type unsafe uses of oop from compiler code

[Erik Österlund]

On Thu, 26 Jan 2023 19:45:31 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> In an ideal world, when you have an oop, its contents should also be an oop. It happens, however, that we have other forms of pointers sometimes, used with the oop type, in some compiler code. We should clean that up.
>
> Looks reasonable.

Thanks for the review @vnkozlov!

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PR: https://git.openjdk.org/jdk/pull/12223