[llvm] [SelectionDAG] Salvage debuginfo when combining load and z|s ext instrs. (PR #188544)

[Orlando Cazalet-Hyams via llvm-commits]

https://github.com/OCHyams commented:

Hi, I've left some inline comments

In addition please could you update the commit message which looks out of date (it mentions fragments instead of DW_OP_LLVM_convert)

https://github.com/llvm/llvm-project/pull/188544