[llvm] [Passes] Always run LowerMatrixIntrinsics, request EarlyCSE on demand. (PR #118507)

[Arthur Eubanks via llvm-commits]

https://github.com/aeubanks commented:

why does lower matrix intrinsics run later in the pipeline rather than earlier? if run earlier we wouldn't need the conditional EarlyCSE run later?

https://github.com/llvm/llvm-project/pull/118507