[llvm] [BranchFolding] Kill common hoisted debug instructions (PR #149999)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

> LLVM Buildbot has detected a new failure on builder `fuchsia-x86_64-linux` running on `fuchsia-debian-64-us-central1-a-1` while building `llvm` at step 4 "annotate".
> 
> Full details are available at: https://lab.llvm.org/buildbot/#/builders/11/builds/20364
> 
> Here is the relevant piece of the build log for the reference

```
FAILED: libc/src/stdio/CMakeFiles/libc.src.stdio.vsscanf.dir/vsscanf.cpp.obj 
```

This seems unrelated

https://github.com/llvm/llvm-project/pull/149999