[llvm] [DAG][PatternMatch] Add support for matchers with flags; NFC (PR #103060)

[Min-Yih Hsu via llvm-commits]

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@@ -452,6 +452,20 @@ struct SDNodeFlags {
   bool hasNoFPExcept() const { return NoFPExcept; }
   bool hasUnpredictable() const { return Unpredictable; }
 
+  bool operator==(const SDNodeFlags &other) const {
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mshockwave wrote:

```suggestion
  bool operator==(const SDNodeFlags &Other) const {
```

https://github.com/llvm/llvm-project/pull/103060