[llvm] [DebugInfo][InstrRef] Copy instr-ref to replacement instrs in X86FixupSetCCPass (PR #159777)

[Orlando Cazalet-Hyams via llvm-commits]

OCHyams wrote:

I'm not sure the answer to those questions. Wouldn't the right time to salvage be at the point the `INSERT_SUBREG` is removed/elided though (i.e., is that a separate issue?)?

It's been a long time since I looked at instr-ref stuff, I naively I thought this might just be an easy fix!

https://github.com/llvm/llvm-project/pull/159777