RFR: 8312585: Rename DisableTHPStackMitigation flag to THPStackMitigation

[David Holmes]

On Mon, 7 Aug 2023 07:13:38 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Thank you for initiating the discussion, and triggering the future style guide change. It was a long time coming :)

Can't take the credit, that was @stefank .

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PR Comment: https://git.openjdk.org/jdk/pull/14992#issuecomment-1667388617