[llvm] [SandboxVectorizer] Define SeedBundle: a set of instructions to be vectorized [retry] (PR #111073)

[Jan Patrick Lehr via llvm-commits]

jplehr wrote:

The error I'm seeing on the OpenMP SLES builder is this

```
/home/botworker/bbot/builds/openmp-offload-sles-build/llvm.src/llvm/lib/Transforms/Vectorize/SandboxVectorizer/SeedCollector.cpp:18:10: fatal error: span: No such file or directory
 #include <span>
          ^~~~~~
compilation terminated.
```

https://github.com/llvm/llvm-project/pull/111073