[jdk17u] RFR: 8275226: Shenandoah: Relax memory constraint for worker claiming tasks/ranges

[Aleksey Shipilev]

Clean backport to improve Shenandoah performance.

Additional testing: 
 - [x] Linux x86_64 fastdebug `hotspot_gc_shenandoah`

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Commit messages:
 - Backport 3b0b6adc3d547fcf4b971536d2404c342d18046f

Changes: https://git.openjdk.java.net/jdk17u/pull/253/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u&pr=253&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275226
  Stats: 6 lines in 4 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk17u/pull/253.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u pull/253/head:pull/253

PR: https://git.openjdk.java.net/jdk17u/pull/253