[llvm] [Matrix] Adjust lifetime.ends during multiply fusion. (PR #84914)

[Francis Visoiu Mistrih via llvm-commits]

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@@ -1946,6 +1951,35 @@ class LowerMatrixIntrinsics {
       for (Instruction *I : ToHoist)
         I->moveBefore(MatMul);
 
+      // Deal with lifetime.end calls that might be between Load0/Load1 and the
+      // store. To avoid introducing loads to dead objects (i.e. after thei
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francisvm wrote:

```suggestion
      // store. To avoid introducing loads to dead objects (i.e. after the
```

https://github.com/llvm/llvm-project/pull/84914