[llvm] [InstrRef] Fix mismatch between LiveDebugValues and salvageCopySSA (PR #124233)

[Shubham Sandeep Rastogi via llvm-commits]

rastogishubham wrote:

Since nothing breaks currently, and I am able to bootstrap build clang, with instruction referencing turned on, on AArch64, I was unable to come up with a testcase for it, I am not the best at writing MIR by hand, and we would need an ORR which translates to a W register being ORRed with the zero register and being written to an X register. Not sure how to do that.

https://github.com/llvm/llvm-project/pull/124233