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

[Arthur Eubanks via llvm-commits]

================
@@ -27,6 +28,15 @@ class LowerMatrixIntrinsicsPass
                      function_ref<StringRef(StringRef)> MapClassName2PassName);
   static bool isRequired() { return true; }
 };
+
+/// A marker analyss to determine if extra passes should be run after lowering
----------------
aeubanks wrote:

```suggestion
/// A marker analysis to signal if extra passes should be run after lowering
```

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