[jdk21u-dev] RFR: 8328075: Shenandoah: Avoid forwarding when objects don't move in full-GC

[Xiaolong Peng]

8328075: Shenandoah: Avoid forwarding when objects don't move in full-GC

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Commit messages:
 - Backport 80ccc989a892e4d9f4e2c9395a100cfabbdcda64

Changes: https://git.openjdk.org/jdk21u-dev/pull/575/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=575&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328075
  Stats: 6 lines in 1 file changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/575.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/575/head:pull/575

PR: https://git.openjdk.org/jdk21u-dev/pull/575