[clang] [clang] Handle template argument conversions for non-pack param to pack argument (PR #110963)

[via cfe-commits]

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@@ -5592,8 +5589,16 @@ bool Sema::CheckTemplateArgumentList(
       } else {
         // Move to the next template parameter.
         ++Param;
+        if (PartialOrderingTTP && PackExpansionIntoNonPack) {
+          SugaredConverted.pop_back();
+          CanonicalConverted.pop_back();
+          continue;
+        }
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cor3ntin wrote:

I think this is worth leaving a comment

https://github.com/llvm/llvm-project/pull/110963