WIP: Native memory tracking support in FFM

[jdksjolen]

---

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

Error

 ⚠️ The pull request body must not be empty.

Warning

 ⚠️ Patch contains a binary file (test/jdk/jdk/internal/loader/URLClassPath/testclasses.jar)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/25757/head:pull/25757
$ git checkout pull/25757

Update a local copy of the PR:
$ git checkout pull/25757
$ git pull https://git.openjdk.org/jdk.git pull/25757/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 25757

View PR using the GUI difftool:
$ git pr show -t 25757

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/25757.diff

[bridgekeeper]

👋 Welcome back jsjolen! A progress list of the required criteria for merging this PR into master 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]

@jdksjolen The following labels will be automatically applied to this pull request:

• core-libs
• hotspot

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

[openjdk]

@jdksjolen this pull request can not be integrated into master due to one or more merge conflicts. To resolve these merge conflicts and update this pull request you can run the following commands in the local repository for your personal fork:

git checkout nmt-in-java-jep
git fetch https://git.openjdk.org/jdk.git master
git merge FETCH_HEAD
# resolve conflicts and follow the instructions given by git merge
git commit -m "Merge master"
git push