RFR: 7903238: JMH: Add entry '.idea/' to file '.gitignore'

[Guoxiong Li]

On Wed, 27 Jul 2022 15:46:30 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Please enable the testing, see the "Pre-submit test status" -> "Details".
> 
> You probably just need to go to https://github.com/lgxbslgx/jmh/actions -- and push the button. Then schedule the run against your branch.

Thanks for your reminding. Done.

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PR: https://git.openjdk.org/jmh/pull/76