RFR: 8279445: Update JMH devkit to 1.34

Tue Jan 4 13:17:11 UTC 2022

On Tue, 4 Jan 2022 12:15:10 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Brings lots of goodies, including automatic enablement of Compiler Blackholes: https://mail.openjdk.java.net/pipermail/jmh-dev/2021-December/003406.html 
> 
> Additional testing:
>  - [x] Devkit creation works
>  - [x] Sample benchmarks runs with new devkit

Marked as reviewed by aph (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/6955