[lilliput-jdk17u:lilliput] RFR: 8304410: [Lilliput/JDK17] Remove unneeded code in ContiguousSpace::object_iterate_from() [v2]

[Roman Kennke]

On Mon, 20 Mar 2023 14:14:13 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> There is some code in space.cpp that resolves a forwarding pointer to get to the Klass* of an object under Lilliput, but it is not necessary and actually causes harm (the null-check doesn't really make sense when the object is indeed forwarded, but we should not observe a forwarded object to begin with). It is not in upstream JDK(21) version of Lilliput and removing it causes no harm.
>> 
>> Testing:
>>  - [x] tier1 -XX:+UseCompactHeaders
>>  - [x] tier1 -XX:-UseCompactHeaders
>>  - [x] tier2 -XX:+UseCompactHeaders
>>  - [x] tier2 -XX:-UseCompactHeaders
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Clean revert to upstream state

Thanks!

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PR: https://git.openjdk.org/lilliput-jdk17u/pull/13