[llvm] [CodeGen] Remove redundant checks (PR #99524)

[via llvm-commits]

AtariDreams wrote:

> define <4 x i32> @foo(<4 x i32> %x) {

I actually added this check to avoid unforeseen bugs and turns out that was bad on my part. But yeah I will add the test now.

https://github.com/llvm/llvm-project/pull/99524