[llvm] [IR][NFC] Add LoadStoreInstAttributes to copy load/store attrs (PR #206470)

[Antonio Frighetto via llvm-commits]

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@@ -249,6 +257,19 @@ class LoadInst : public UnaryInstruction {
     setSyncScopeID(SSID);
   }
 
+  /// Returns the attributes of this load instruction.
+  LoadStoreInstAttributes getAttributes() const {
+    return {isVolatile(), getAlign(), getOrdering(), getSyncScopeID()};
+  }
+
+  /// Sets the attributes of this load instruction.
+  void setAttributes(const LoadStoreInstAttributes &Attrs) {
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antoniofrighetto wrote:

```suggestion
  void setProperties(const LoadStoreInstAttributes &Attrs) {
```

https://github.com/llvm/llvm-project/pull/206470