[llvm] [ADT] Add const to AllocatorList::{empty,size} (PR #161320)

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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/161320.diff


1 Files Affected:

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


``````````diff
diff --git a/llvm/include/llvm/ADT/AllocatorList.h b/llvm/include/llvm/ADT/AllocatorList.h
index 04d0afc9d076e..2716b83ca224a 100644
--- a/llvm/include/llvm/ADT/AllocatorList.h
+++ b/llvm/include/llvm/ADT/AllocatorList.h
@@ -155,8 +155,8 @@ template <class T, class AllocatorT> class AllocatorList : AllocatorT {
     std::swap(getAlloc(), RHS.getAlloc());
   }
 
-  bool empty() { return List.empty(); }
-  size_t size() { return List.size(); }
+  [[nodiscard]] bool empty() const { return List.empty(); }
+  [[nodiscard]] size_t size() const { return List.size(); }
 
   iterator begin() { return iterator(List.begin()); }
   iterator end() { return iterator(List.end()); }

``````````

</details>


https://github.com/llvm/llvm-project/pull/161320