[llvm] [llvm][NVPTX] Fix quadratic runtime in ProxyRegErasure (PR #105730)

[Jeff Niu via llvm-commits]

Mogball wrote:

> Thanks for the fix, @Mogball!
> 
> Is it not possible to write compile-time tests in LLVM?

I'm not aware of any infrastructure or testing regimes for doing something like that. Accurate benchmarking is less trivial than running unit tests :P

https://github.com/llvm/llvm-project/pull/105730