[clang] [Clang] Implement consteval blocks for C++26 (PR #188665)

[Balázs Benics via cfe-commits]

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@@ -759,6 +759,11 @@ class TrivialFunctionAnalysisVisitor
     return true;
   }
 
+  bool VisitConstevalBlockDecl(const ConstevalBlockDecl *SAD) {
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steakhal wrote:

```suggestion
  bool VisitConstevalBlockDecl(const ConstevalBlockDecl *) {
```

https://github.com/llvm/llvm-project/pull/188665