RFR: Cleanups, TODOs, asserts (part 1) [v2]

[William Kemper]

On Wed, 5 Apr 2023 16:36:01 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> I have been reading the `openjdk/shenandoah` vs `openjdk/jdk` diff and these are the simple code massages we can do to improve and bullet-proof the code, hopefully without changing the semantics. This would continue with more parts later.
>> 
>> Additional testing:
>>  - [x] macos-aarch64-server-fastdebug (some pre-existing failures)
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   New assert fires, but instead of fixing it, remove useless live_memory completely

Marked as reviewed by wkemper (Committer).

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PR Review: https://git.openjdk.org/shenandoah/pull/245#pullrequestreview-1375291476