RFR: 8327240: Remove unused Tier2CompileThreshold/Tier2BackEdgeThreshold product flags

[Dean Long]

On Mon, 22 Apr 2024 20:23:49 GMT, Sonia Zaldana Calles <szaldana at openjdk.org> wrote:

> Hi all, 
> 
> This PR removes the unused options ```Tier2CompileThreshold``` and ```Tier2BackEdgeThreshold```. 
> 
> Testing: 
> - [x] Verified unrecognized option error is reported after removing options. 
> 
> Thanks, 
> Sonia

Shouldn't we first ask the question: why aren't they used?  Maybe there is a bug, and in fact they should be used.

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PR Comment: https://git.openjdk.org/jdk/pull/18904#issuecomment-2073804200