Consider XRay instrumentation support
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- Rust
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Description
It might be useful to support XRay Instrumentation ([whitepaper](https://research.google/pubs/xray-a-function-call-tracing-system/), [LLVM docs](https://llvm.org/docs/XRay.html), [Rust tracking issue](https://github.com/rust-lang/rust/issues/102921)).
If it turns out to be strictly superior, this could potentially replace the current `mcount` instrumentation. HermitCore has supported this once: [hermit-os/hermit-playground/usr/xray/README.md](https://github.com/hermit-os/hermit-playground/blob/master/usr/xray/README.md).
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