[clang] [clang][c++20] Fix code coverage mapping crash with generalized NTTPs (PR #85837)

[Eli Friedman via cfe-commits]

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@@ -2177,7 +2177,8 @@ struct CounterCoverageMappingBuilder
   }
 
   void VisitOpaqueValueExpr(const OpaqueValueExpr* OVE) {
-    Visit(OVE->getSourceExpr());
+    if (const Expr *SE = OVE->getSourceExpr())
----------------
efriedma-quic wrote:

I suspect the correct check here is `if (OVE->isUnique())`?  See 
https://reviews.llvm.org/D39562 .  CC @ahatanak.

https://github.com/llvm/llvm-project/pull/85837
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