[llvm] [ADT] Add const to operator== in ArrayRef.h (PR #161321)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

While I am at it, this patch adds [[nodiscard]].


---
Full diff: https://github.com/llvm/llvm-project/pull/161321.diff


1 Files Affected:

- (modified) llvm/include/llvm/ADT/ArrayRef.h (+4-2) 


``````````diff
diff --git a/llvm/include/llvm/ADT/ArrayRef.h b/llvm/include/llvm/ADT/ArrayRef.h
index fb91690bb0eb3..448d10013d371 100644
--- a/llvm/include/llvm/ADT/ArrayRef.h
+++ b/llvm/include/llvm/ADT/ArrayRef.h
@@ -547,7 +547,8 @@ namespace llvm {
   }
 
   template <typename T>
-  inline bool operator==(SmallVectorImpl<T> &LHS, ArrayRef<T> RHS) {
+  [[nodiscard]] inline bool operator==(const SmallVectorImpl<T> &LHS,
+                                       ArrayRef<T> RHS) {
     return ArrayRef<T>(LHS).equals(RHS);
   }
 
@@ -557,7 +558,8 @@ namespace llvm {
   }
 
   template <typename T>
-  inline bool operator!=(SmallVectorImpl<T> &LHS, ArrayRef<T> RHS) {
+  [[nodiscard]] inline bool operator!=(const SmallVectorImpl<T> &LHS,
+                                       ArrayRef<T> RHS) {
     return !(LHS == RHS);
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/161321