Explore whether adding XRay attributes to LLVM IR is worthwhile
LLVM has support for XRay which is a tracing framework developed by Google. It might be possible to add the relevant function attributes to the IR we generate to get access to detailed traces which can be analysed using existing tooling.
https://llvm.org/docs/XRay.html
<details><summary>Trac metadata</summary>
| Trac field | Value |
| ---------------------- | ------------ |
| Version | 8.6.2 |
| Type | Task |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
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</details>
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