[llvm-branch-commits] [llvm] release/18.x: [ARM] Switch to LiveRegUnits to fix r7 register allocation bug (PR #84475)

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AtariDreams wrote:

> This is, as far as I can tell, not a miscompile; probably not worth taking on the 18.x branch.
> 
> (Also, it's usually not a good idea to open a PR for a cherry-pick before the original patch is merged.)

On that last part, it was supposed to be merged but then split off in the event other changes had to be reverted. 

https://github.com/llvm/llvm-project/pull/84475