[llvm] [RISCV][EVL] Drop EVLIndVarSimplifyPass from the pipeline (PR #151483)

[Min-Yih Hsu via llvm-commits]

mshockwave wrote:

> Does "stop emitting" imply a complete removal, or just adding a switch to disable it? I'm not sure it is consistent to remove the metadata entirely while there's still a pass that queries it.

Sorry this message slipped through my radar: yes, I think we could just add a switch to disable it for now.

https://github.com/llvm/llvm-project/pull/151483