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

[Antonio Frighetto via llvm-commits]

================
@@ -249,6 +257,19 @@ class LoadInst : public UnaryInstruction {
     setSyncScopeID(SSID);
   }
 
+  /// Returns the attributes of this load instruction.
+  LoadStoreInstAttributes getAttributes() const {
----------------
antoniofrighetto wrote:

```suggestion
  LoadStoreInstAttributes getProperties() const {
```

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