[clang] [NFC][Clang] Adopt simplified `getTrailingObjects` in DeclFriend (PR #140081)

[via cfe-commits]

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@@ -90,8 +90,7 @@ class FriendDecl final
       : Decl(Decl::Friend, DC, L), Friend(Friend), FriendLoc(FriendL),
         EllipsisLoc(EllipsisLoc), UnsupportedFriend(false),
         NumTPLists(FriendTypeTPLists.size()) {
-    for (unsigned i = 0; i < NumTPLists; ++i)
-      getTrailingObjects<TemplateParameterList *>()[i] = FriendTypeTPLists[i];
+    llvm::copy(FriendTypeTPLists, getTrailingObjects());
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Sirraide wrote:

I think this should be `uninitialized_copy`?

https://github.com/llvm/llvm-project/pull/140081
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