[llvm] [CodeGen] Correctly handle non-standard cases in RemoveLoadsIntoFakeUses (PR #111551)

[Matt Arsenault via llvm-commits]

arsenm wrote:

Spills for these still feels like a situation we should have avoided in the first place. Is it possible to teach foldMemoryOperand to absorb the spill reference directly into the instruction, or otherwise avoid inserting the restore in the first place? 

https://github.com/llvm/llvm-project/pull/111551