RFR: 8279445: Update JMH devkit to 1.34

[Aleksey Shipilev]

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

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jdk/pull/6955/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6955&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8279445
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6955.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6955/head:pull/6955

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