[llvm] AtomicExpand: Stop using report_fatal_error (PR #147300)

[Christudasan Devadasan via llvm-commits]

================
@@ -65,6 +65,17 @@ class AtomicExpandImpl {
   const DataLayout *DL = nullptr;
 
 private:
+  void handleFailure(Instruction &FailedInst, const Twine &Msg) const {
+    LLVMContext &Ctx = FailedInst.getContext();
+
+    // TODO: Do not use generic error type
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cdevadas wrote:

```suggestion
    // TODO: Do not use generic error type.
```

https://github.com/llvm/llvm-project/pull/147300