[llvm] [RISCV] Enable early if-conversion (PR #92959)

[Mikhail Gudim via llvm-commits]

mgudim wrote:

This is a  fix for detecting when condition is loop-invariant: https://github.com/llvm/llvm-project/pull/95877

That needs to be merged before this patch.

https://github.com/llvm/llvm-project/pull/92959