[llvm] Revert "[SelectionDAG] Salvage debuginfo when combining load and sext… (PR #171745)

[Shubham Sandeep Rastogi via llvm-commits]

rastogishubham wrote:

I didn't want to come off as someone who doesn't respond, so I did anyway, a suggesstion for the the future is that instead of deleting your response, just use a ~strikethrough~ and add an edit instead. It is quite confusing otherwise

https://github.com/llvm/llvm-project/pull/171745