Initial upstreaming of Rust ADBench implementations

[ZuseZ4]

One of my last steps in order to prepare autodiff on nightly was to upstream those benchmarks into r-l/r,
since they can now be part of our CI runs. Those are the only 5 real-world testcases of a relevant size which we have, and we ran into a lot of enzyme bugs with them in the past (and depending on the config still do).
I think they are good to have around to learn about both Enzyme regressions and improvements.
If any of them fails after an llvm or rustc update, people can simply disable the specific one.

I have a safe and unsafe (ptr based) implementation for each, since they have quite a perf difference between them (unsafe usually being slower). They also can trigger quite different bugs in Enzyme.
For the same reason I'd love to also have a version around which uses libm instead of the rust builtin function, since the libm version gets vectorized better in some of these benchmarks, which again triggered different bugs in the past.

rust-lang/rust-project-goals#109 (comment)

r? @oli-obk

Edit: I probably want to change the folder structure, so that we have all the lib.rs on a higher level, so x.py test only runs them, and ignores the other dependent files. I'll look into it.

[rustbot]

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[rust-log-analyzer]

The job aarch64-gnu-llvm-20-2 failed! Check out the build log: (web) (plain enhanced) (plain)

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fmt: checked 6550 files
tidy check
tidy [rustdoc_json (src)]: `rustdoc-json-types` modified, checking format version
tidy: Skipping binary file check, read-only filesystem
tidy [style (tests)]: /checkout/tests/ui/autodiff/adbench/ode-real/src/unsf.rs:38: line longer than 100 chars
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tidy [style (tests)]: /checkout/tests/ui/autodiff/adbench/lstm/src/unsf.rs:28: TODO is used for tasks that should be done before merging a PR; If you want to leave a message in the codebase use FIXME
tidy [style (tests)]: /checkout/tests/ui/autodiff/adbench/lstm/src/unsf.rs:35: tab character
tidy [style (tests)]: /checkout/tests/ui/autodiff/adbench/lstm/src/unsf.rs:43: line longer than 100 chars
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tidy [style (tests)]: /checkout/tests/ui/autodiff/adbench/ba/src/lib.rs: too many trailing newlines (2)
tidy [style (tests)]: /checkout/tests/ui/autodiff/adbench/gmm/src/unsafe.rs:21: line longer than 100 chars
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tidy [style (tests)]: FAIL
tidy: The following check failed: style (tests)
Bootstrap failed while executing `--stage 2 test --skip tests --skip coverage-map --skip coverage-run --skip library --skip tidyselftest`
Command `/checkout/obj/build/aarch64-unknown-linux-gnu/stage1-tools-bin/rust-tidy /checkout /checkout/obj/build/aarch64-unknown-linux-gnu/stage0/bin/cargo /checkout/obj/build 4 yarn` failed with exit code 1
Created at: src/bootstrap/src/core/build_steps/tool.rs:1594:23
Executed at: src/bootstrap/src/core/build_steps/test.rs:1285:29

Command has failed. Rerun with -v to see more details.
Build completed unsuccessfully in 0:00:49
  local time: Thu Nov 20 07:42:36 UTC 2025
  network time: Thu, 20 Nov 2025 07:42:37 GMT
##[error]Process completed with exit code 1.
##[group]Run echo "disk usage:"