[jdk17u-dev] RFR: 8290374: Shenandoah: Remove inaccurate comment on SBS::load_reference_barrier()

[Aleksey Shipilev]

Clean backport, provides the grounds for more clean backports.

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

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Commit messages:
 - Backport 011958d30b275f0f6a2de097938ceeb34beb314d

Changes: https://git.openjdk.org/jdk17u-dev/pull/894/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=894&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8290374
  Stats: 7 lines in 1 file changed: 0 ins; 5 del; 2 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/894.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/894/head:pull/894

PR: https://git.openjdk.org/jdk17u-dev/pull/894