[clang] [Clang] Fix a crash when using ast-dump=json (PR #70224)

[Aaron Ballman via cfe-commits]

================
@@ -819,6 +819,10 @@ void JSONNodeDumper::VisitNamedDecl(const NamedDecl *ND) {
     if (VD && VD->hasLocalStorage())
       return;
 
+    // Do not mangle template deduction guides.
+    if (const auto DG = dyn_cast<CXXDeductionGuideDecl>(ND))
----------------
AaronBallman wrote:

```suggestion
    if (isa<CXXDeductionGuideDecl>(ND))
```

https://github.com/llvm/llvm-project/pull/70224
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