RFR: 8328101: Parallel: Obsolete ParallelOldDeadWoodLimiterMean and ParallelOldDeadWoodLimiterStdDev [v3]

[Albert Mingkun Yang]

> Simple refactoring Parallel full-gc dead word calculation and removing two jvm flags.
> 
> Test: tier1-3

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18278/files
  - new: https://git.openjdk.org/jdk/pull/18278/files/d60f12e5..013f3c05

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18278&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18278&range=01-02

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/18278.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18278/head:pull/18278

PR: https://git.openjdk.org/jdk/pull/18278