[llvm] [Matrix] Don't update Changed based on Visit* return value (NFC). (PR #142417)

[Jon Roelofs via llvm-commits]

================
@@ -2105,29 +2108,27 @@ class LowerMatrixIntrinsics {
   }
 
   /// Lower load instructions, if shape information is available.
-  bool VisitLoad(LoadInst *Inst, Value *Ptr, IRBuilder<> &Builder) {
+  void VisitLoad(LoadInst *Inst, Value *Ptr, IRBuilder<> &Builder) {
----------------
jroelofs wrote:

I'll rebase once this lands.

https://github.com/llvm/llvm-project/pull/142417