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

[Aaron Ballman via cfe-commits]

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@@ -377,6 +377,8 @@ Miscellaneous Clang Crashes Fixed
   `Issue 64065 <https://github.com/llvm/llvm-project/issues/64065>`_
 - Fixed a crash when check array access on zero-length element.
   `Issue 64564 <https://github.com/llvm/llvm-project/issues/64564>`_
+- Fixed a crash when -ast-dump=json was used for code using template
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AaronBallman wrote:

```suggestion
- Fixed a crash when ``-ast-dump=json`` was used for code using template
```

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