RFR: 8307067: remove broken EnableThreadSMRExtraValidityChecks option [v3]

[David Holmes]

On Wed, 10 May 2023 19:56:53 GMT, Daniel D. Daugherty <dcubed at openjdk.org> wrote:

>> A trivial fix to remove broken EnableThreadSMRExtraValidityChecks option.
>
> Daniel D. Daugherty 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 three additional commits since the last revision:
> 
>  - Merge branch 'master' into JDK-8307067
>  - dholmes CR - change ':' to '.'.
>  - 8307067: remove broken EnableThreadSMRExtraValidityChecks option

Marked as reviewed by dholmes (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13704#pullrequestreview-1421723530