[foreign-abi] RFR: Nio benchmark

[Henry Jen]

On Tue, 4 Aug 2020 17:51:09 GMT, Henry Jen <henryjen at openjdk.org> wrote:

> This added a simple benchmark to get DirectoryStream implemented with Panama, compared to a simplified JNI version also
> the stock implementation. Currently MacOS and Linux are included, for other platform, default kicks in and abort with
> exception.  To enable platform dependant code needed by Panama, we add a folder, test/os, where we can put platform
> override implementation. This allows minimum change to the code layout, however, the colocation is less than desired.
> Support package of jdk.incubator.jbind.core is added, as that's what needed for jbind generated code. This is basically
> what jextract generated RuntimeHelper.
> LibC.java is generated by jbind. The command used to generate the file is gencode.sh, the patch also contains argument
> files.
> When generate code with jbind, there are redundant files no needed for the benchmark, use `git status` to identify
> those and it's safe to remove them and only keep the LibC.java.

It's just a reference, the pull request should be split up and create PRs for appropriate upstream

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PR: https://git.openjdk.java.net/panama-foreign/pull/278