RFR: 8327240: Obsolete Tier2CompileThreshold/Tier2BackEdgeThreshold product flags [v3]

[Sonia Zaldana Calles]

> Hi all, 
> 
> This PR removes the unused options ```Tier2CompileThreshold``` and ```Tier2BackEdgeThreshold```. 
> 
> Testing: 
> - [x] Verified warning is issued as support was removed. 
> 
> Thanks, 
> Sonia

Sonia Zaldana Calles 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 five additional commits since the last revision:

 - formatting
 - Merge master
 - Adding to obsolete list
 - Deleting usage of flag in test
 - 8327240: Remove unused Tier2CompileThreshold/Tier2BackEdgeThreshold product flags

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/18904/files
  - new: https://git.openjdk.org/jdk/pull/18904/files/ed6b0048..ac2dc109

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18904&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18904&range=01-02

  Stats: 9528 lines in 289 files changed: 5822 ins; 2693 del; 1013 mod
  Patch: https://git.openjdk.org/jdk/pull/18904.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18904/head:pull/18904

PR: https://git.openjdk.org/jdk/pull/18904