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

[Artem Belevich via llvm-commits]

Artem-B wrote:

@Groverkss -- what happens when we compile the reproducer? Does it generate invalid output or is it a compiler crasher?

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