[llvm] [STLExtras] Add out-of-line definition of friend operator== for C++20 (PR #72348)

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git-clang-format --diff 3f743fd3a319c3b142d989b4d986e3b11fe8109f c8d3c272564f0c8d2c43c501506913c7f05a3eda -- llvm/include/llvm/ADT/STLExtras.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/include/llvm/ADT/STLExtras.h b/llvm/include/llvm/ADT/STLExtras.h
index ecaa7cce15..a136eeb0ff 100644
--- a/llvm/include/llvm/ADT/STLExtras.h
+++ b/llvm/include/llvm/ADT/STLExtras.h
@@ -1356,16 +1356,16 @@ protected:
 /// FIXME: Make me a member function instead of friend when it works in C++20.
 template <typename OtherT, typename DerivedT, typename BaseT, typename T,
           typename PointerT, typename ReferenceT>
-bool operator==(const indexed_accessor_range_base<DerivedT, BaseT, T,
-                                                  PointerT, ReferenceT> &lhs,
+bool operator==(const indexed_accessor_range_base<DerivedT, BaseT, T, PointerT,
+                                                  ReferenceT> &lhs,
                 const OtherT &rhs) {
   return std::equal(lhs.begin(), lhs.end(), rhs.begin(), rhs.end());
 }
 
 template <typename OtherT, typename DerivedT, typename BaseT, typename T,
           typename PointerT, typename ReferenceT>
-bool operator!=(const indexed_accessor_range_base<DerivedT, BaseT, T,
-                                                  PointerT, ReferenceT> &lhs,
+bool operator!=(const indexed_accessor_range_base<DerivedT, BaseT, T, PointerT,
+                                                  ReferenceT> &lhs,
                 const OtherT &rhs) {
   return !(lhs == rhs);
 }

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https://github.com/llvm/llvm-project/pull/72348