[clang] [Sema] When checking for constraint equivalence, do not calculate satisfaction (PR #74490)

[Ilya Biryukov via cfe-commits]

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@@ -4077,6 +4084,7 @@ Sema::SubstExpr(Expr *E, const MultiLevelTemplateArgumentList &TemplateArgs) {
   TemplateInstantiator Instantiator(*this, TemplateArgs,
                                     SourceLocation(),
                                     DeclarationName());
+  Instantiator.setEvaluateConstraints(false);
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ilya-biryukov wrote:

Oh, and another signal that gave me optimism is that all existing tests pass. However, I am not sure if they are extensive.

https://github.com/llvm/llvm-project/pull/74490