RFR: 8322543: Parallel: Remove unused _major_pause_old_slope_counter

[Albert Mingkun Yang]

On Wed, 20 Dec 2023 11:49:49 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial removing dead code.

Thanks for the review.

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PR Comment: https://git.openjdk.org/jdk/pull/17168#issuecomment-1864730978