RFR: 8316670: Remove effectively unused nmethodBucket::_count [v2]

[Thomas Schatzl]

> Hi all,
> 
>   please review this removal of effectively dead code: `nmethodBucket::_count` is effectively dead code because as it's intended to be used as a refcount to check for mismatched add/remove calls, for some time now the remove-call has been removed, making the count obsolete.
> 
> Testing: gha
> 
> Thanks,
>   Thomas

Thomas Schatzl has updated the pull request incrementally with one additional commit since the last revision:

  dlong review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15863/files
  - new: https://git.openjdk.org/jdk/pull/15863/files/f31f7c1f..26cc3ad9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15863&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15863&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15863.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15863/head:pull/15863

PR: https://git.openjdk.org/jdk/pull/15863