[clang] [clang] check deduction consistency when partial ordering function templates (PR #100692)

[via cfe-commits]

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@@ -859,8 +861,10 @@ class PackDeductionScope {
     // by this pack expansion, then clear out the deduction.
     DeducedFromEarlierParameter = !Deduced[Index].isNull();
     DeducedPack Pack(Index);
-    Pack.Saved = Deduced[Index];
-    Deduced[Index] = TemplateArgument();
+    if (!FinishingDeduction) {
+      Pack.Saved = Deduced[Index];
+      Deduced[Index] = TemplateArgument();
+    }
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cor3ntin wrote:

Can we add pack-related tests?

https://github.com/llvm/llvm-project/pull/100692
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