[jdk21u-dev] RFR: 8316670: Remove effectively unused nmethodBucket::_count [v2]

[Goetz Lindenmaier]

> I backport this for parity with 21.0.4-oracle.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'openjdk:master' into backport-GoeLin-837783c2
 - Backport 837783c2d333627bfcbef00fc67024aff847bd9f

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

Changes:
  - all: https://git.openjdk.org/jdk21u-dev/pull/428/files
  - new: https://git.openjdk.org/jdk21u-dev/pull/428/files/f806a527..b0b1ff54

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=428&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=428&range=00-01

  Stats: 309 lines in 5 files changed: 301 ins; 2 del; 6 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