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

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@@ -1343,6 +1343,9 @@ namespace {
     DeclarationName Entity;
     // Whether to evaluate the C++20 constraints or simply substitute into them.
     bool EvaluateConstraints = true;
+    // Whether Substitution was Incomplete, that is, we tried to substitute in
+    // any template arguments which were null.
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cor3ntin wrote:

Beecause they were not yet provided, presumably?

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