[jdk21u-dev] RFR: 8316670: Remove effectively unused nmethodBucket::_count

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 837783c2d333627bfcbef00fc67024aff847bd9f

Changes: https://git.openjdk.org/jdk21u-dev/pull/428/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=428&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316670
  Stats: 43 lines in 2 files changed: 1 ins; 25 del; 17 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/428.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/428/head:pull/428

PR: https://git.openjdk.org/jdk21u-dev/pull/428