[llvm] [ADT] Fix comment typos in STLForwardCompat.h (PR #157789)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-adt

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

st::type_identity_t is from C++20, not C++23.


---
Full diff: https://github.com/llvm/llvm-project/pull/157789.diff


1 Files Affected:

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


``````````diff
diff --git a/llvm/include/llvm/ADT/STLForwardCompat.h b/llvm/include/llvm/ADT/STLForwardCompat.h
index 81b9a685e11d2..0ef8cb5d02e50 100644
--- a/llvm/include/llvm/ADT/STLForwardCompat.h
+++ b/llvm/include/llvm/ADT/STLForwardCompat.h
@@ -36,7 +36,7 @@ template <typename T>
 using remove_cvref_t // NOLINT(readability-identifier-naming)
     = typename llvm::remove_cvref<T>::type;
 
-// TODO: Remove this in favor of std::type_identity<T> once we switch to C++23.
+// TODO: Remove this in favor of std::type_identity<T> once we switch to C++20.
 template <typename T>
 struct type_identity // NOLINT(readability-identifier-naming)
 {
@@ -44,7 +44,7 @@ struct type_identity // NOLINT(readability-identifier-naming)
 };
 
 // TODO: Remove this in favor of std::type_identity_t<T> once we switch to
-// C++23.
+// C++20.
 template <typename T>
 using type_identity_t // NOLINT(readability-identifier-naming)
     = typename llvm::type_identity<T>::type;

``````````

</details>


https://github.com/llvm/llvm-project/pull/157789