[jdk21u-dev] RFR: 8331411: Shenandoah: Reconsider spinning duration in ShenandoahLock

[Xiaolong Peng]

Hi all,

This pull request contains a backport of commit [817edcb6](https://github.com/openjdk/jdk/commit/817edcb697cbb8c608c9292cdc4b99db4f5844dc) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Xiaolong Peng on 26 Jun 2024 and was reviewed by Aleksey Shipilev, Kelvin Nilsen and William Kemper.

Additional test:
- [x] `make clean test TEST=hotspot_gc_shenandoah`

Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR   
   jtreg:test/hotspot/jtreg:hotspot_gc_shenandoah      261   261     0     0   
==============================
TEST SUCCESS


Thanks!

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

Commit messages:
 - Backport 817edcb697cbb8c608c9292cdc4b99db4f5844dc

Changes: https://git.openjdk.org/jdk21u-dev/pull/850/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=850&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331411
  Stats: 47 lines in 2 files changed: 22 ins; 11 del; 14 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/850.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/850/head:pull/850

PR: https://git.openjdk.org/jdk21u-dev/pull/850