RFR: 8254292: Update JMH devkit to 1.26

[Andrew Haley]

On Fri, 9 Oct 2020 13:09:43 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> It is currently at 1.21, and thus misses a bunch of fixes and improvements.
>> 
>> Testing:
>>   - [x] Creating the JMH devkit
>>   - [x] Using a new devkit with `make test TEST=micro:RecordDeserialization`
>
> Marked as reviewed by erikj (Reviewer).

After
 
 $ sh make/devkit/createJMHBundle.sh
 $ sh ./configure ... --with-boot-jdk=/local/jdk-15+36/ --with-jmh=build/jmh/jars/
 $ CONF=release make images
 $ CONF=release make test TEST=micro:RecordDeserialization

I get

 $ CONF=release make test TEST=micro:RecordDeserialization
Building target 'test' in configuration 'linux-x86_64-server-release'
Test selection 'micro:RecordDeserialization', will run:
* micro:RecordDeserialization

Running test 'micro:RecordDeserialization'
Error: Unable to access jarfile /local/jdk-skara/build/linux-x86_64-server-release/images/test/micro/benchmarks.jar

There isn't even a `build/linux-x86_64-server-release/images/test/micro` directory.

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PR: https://git.openjdk.java.net/jdk/pull/575