modified ClassfileBenchmark

[asotona]

modified ClassfileBenchmark to compare performance of direct MemoryModel impl with memory copy

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Integration blocker

 ⚠️ Dependency #24139 must be integrated first

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/24297/head:pull/24297
$ git checkout pull/24297

Update a local copy of the PR:
$ git checkout pull/24297
$ git pull https://git.openjdk.org/jdk.git pull/24297/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 24297

View PR using the GUI difftool:
$ git pr show -t 24297

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/24297.diff

[bridgekeeper]

👋 Welcome back asotona! A progress list of the required criteria for merging this PR into pr/24139 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

⚠️ @asotona a branch with the same name as the source branch for this pull request (pr/24139) is present in the target repository. If you eventually integrate this pull request then the branch pr/24139 in your personal fork will diverge once you sync your personal fork with the upstream repository.

To avoid this situation, create a new branch for your changes and reset the pr/24139 branch. You can do this by running the following commands in a local repository for your personal fork. Note: you do not have to name the new branch NEW-BRANCH-NAME.

$ git checkout -b NEW-BRANCH-NAME
$ git branch -f pr/24139 29e8872cf41b5e8c610c8249bc250a34a3ad480c
$ git push -f origin pr/24139

Then proceed to create a new pull request with NEW-BRANCH-NAME as the source branch and close this one.

[openjdk]

@asotona The following label will be automatically applied to this pull request:

• core-libs

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.