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

[Roman Kennke]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/lilliput-jdk17u/pull/13/files
  - new: https://git.openjdk.org/lilliput-jdk17u/pull/13/files/97fe4d63..b14f126a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=13&range=01
 - incr: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=13&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/13.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u pull/13/head:pull/13

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