[llvm] [DebugInfo][SimpleLoopUnswitch] Fix missing debug location updates (PR #97662)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

This patch involves some slightly more complex updates than other recent fixes so I've just got a few questions inline to make sure I understand the it and to check that we're doing the right thing.

https://github.com/llvm/llvm-project/pull/97662