8370227: Migrate micros-javac benchmarks from jmh-jdk-microbenchmarks

[cl4es]

To improve and consolidate workflow this PR proposes moving micros-javac from https://github.com/openjdk/jmh-jdk-microbenchmarks into the main OpenJDK tree.

Most of jmh-jdk-microbenchmarks was effectively migrated in-tree as part of https://openjdk.org/jeps/230
These javac benchmarks, however, were added after migration as a stop-gap solution: they rely on an antrun task to download a configurable set of JDK source files deemed problematic to integrate with the JDK build and the resulting benchmark jar is quite bulky (~52M), so unconditionally piling that on the test image built on every change seems unwise.

Proposal:

• The JMH benchmarks are moved over as-is along with a flattened and updated maven pom.xml into a new non-jtreg test root, test/benchmarks/micros-javac
• Any integration with the JDK build is deferred to a future enhancement. I.e., no integration with make test or equivalent of make micros-javac for now. Instead users of these benchmarks are encouraged to build the benchmarks by running mvn install in the micros-javac folder, similar to what you would do today in the jmh-jdk-microbenchmarks project.

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Progress

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Issue

• JDK-8370227: Migrate micros-javac benchmarks from jmh-jdk-microbenchmarks (Enhancement - P4)

Reviewers

• Eric Caspole (@ericcaspole - Reviewer) Review applies to b3caf9d8
• Adam Sotona (@asotona - Reviewer)
• Erik Joelsson (@erikj79 - Reviewer)

Reviewing

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[openjdk]

@cl4es This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8370227: Migrate micros-javac benchmarks from jmh-jdk-microbenchmarks

Reviewed-by: asotona, erikj, ecaspole

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 29 new commits pushed to the master branch:

• 92e380c: 8361451: Test vmTestbase/metaspace/stressHierarchy/stressHierarchy012/TestDescription.java fails with OutOfMemoryError: Metaspace
• 65b3239: 8370242: JFR: Clear event reference eagerly when using EventStream
• cbbb0a8: 8367976: Validate and clamp jdk.httpclient.bufsize
• ... and 26 more: https://git.openjdk.org/jdk/compare/ea7186a87f990346fe6af6d4a36989d87e6f98d1...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

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[mlbridge]

Webrevs

• 02: Full - Incremental (9a6d4bf8)
• 01: Full - Incremental (b3caf9d8)
• 00: Full (609970fb)

[ericcaspole]

Approved.