[lilliput-jdk17u:lilliput] RFR: 8308423: [Lilliput/JDK17] Cherry-pick GC forwarding [v2]

[Roman Kennke]

> I'd like to pick up the improvements that have been made in full-GC and self-forwarding in the upstream issues [JDK-8305896](https://bugs.openjdk.org/browse/JDK-8305896) and [JDK-8305898](https://bugs.openjdk.org/browse/JDK-8305898). Let's port them to Lilliput/JDK17.
> 
> The version in upstream PR uses resourceHash.hpp as fallback-table. Unfortunately, that doesn't cleanly work with the JDK17 version of resourceHash.hpp, so I used an earlier version with a self-implemented fallback-table.
> 
> Testing:
>  - [x] hotspot_gc
>  - [x] tier1
>  - [ ] tier2

Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:

  Add missing fastHash.hpp

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

Changes:
  - all: https://git.openjdk.org/lilliput-jdk17u/pull/22/files
  - new: https://git.openjdk.org/lilliput-jdk17u/pull/22/files/07fb68f6..d9236ac5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=22&range=01
 - incr: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=22&range=00-01

  Stats: 97 lines in 1 file changed: 97 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/22.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/22/head:pull/22

PR: https://git.openjdk.org/lilliput-jdk17u/pull/22