[clang] [clang-tools-extra] [clang] Concepts: support pack expansions for type constraints (PR #132626)

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@@ -78,6 +78,16 @@ class UnresolvedSetImpl;
 class VarTemplateDecl;
 enum class ImplicitParamKind;
 
+struct AssociatedConstraint {
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cor3ntin wrote:

Can you add a comment here?

https://github.com/llvm/llvm-project/pull/132626