[clang] [llvm] [LICM] Sink unused l-invariant loads in preheader. (PR #157559)

[Nikita Popov via llvm-commits]

nikic wrote:

> > Unused loop invariant loads were not sunk from preheader to exit block, increasing live range.
> 
> What live range? If the result is unused, how can it contribute to register pressure in the loop body?

I believe "unused" here refers to "unused inside the loop, but used after the loop".

https://github.com/llvm/llvm-project/pull/157559