[clang] Reapply "[Clang] Improve diagnostics for expansion length mismatch" (PR #121044)

[via cfe-commits]

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@@ -75,7 +75,7 @@ getDepthAndIndex(UnexpandedParameterPack UPP) {
   if (const auto *TTP = dyn_cast<const TemplateTypeParmType *>(UPP.first))
     return std::make_pair(TTP->getDepth(), TTP->getIndex());
 
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cor3ntin wrote:

We should add support for SubstTemplateTypeParmPackType / 
SubstNonTypeTemplateParmPackExpr here

https://github.com/llvm/llvm-project/pull/121044
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