[lilliput-jdk17u:lilliput] RFR: 8310156: [Lilliput/JDK17] Specialize full-GC loops

[Roman Kennke]

We already ported most of [JDK-8305896](https://bugs.openjdk.org/browse/JDK-8305896) to Lilliput/JDK17. What's missing is the specialization of the full-GC loops so that performance on the legacy path is not impacted and performance on the alt-GC-forwarding path is minimized.

Testing:
 - [x] hotspot_gc
 - [ ] tier1 -XX:+UseG1GC
 - [ ] tier1 -XX:+UseSerialGC
 - [ ] tier1 -XX:+UseShenandoahGC
 - [ ] tier2 -XX:+UseG1GC
 - [ ] tier2 -XX:+UseSerialGC
 - [ ] tier2 -XX:+UseShenandoahGC

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Commit messages:
 - 8310156: [Lilliput/JDK17] Specialize full-GC loops

Changes: https://git.openjdk.org/lilliput-jdk17u/pull/32/files
 Webrev: https://webrevs.openjdk.org/?repo=lilliput-jdk17u&pr=32&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310156
  Stats: 496 lines in 26 files changed: 300 ins; 90 del; 106 mod
  Patch: https://git.openjdk.org/lilliput-jdk17u/pull/32.diff
  Fetch: git fetch https://git.openjdk.org/lilliput-jdk17u.git pull/32/head:pull/32

PR: https://git.openjdk.org/lilliput-jdk17u/pull/32