[clang] [clang-tools-extra] [clang] NFCI: use TemplateArgumentLoc for NTTP DefaultArgument (PR #92852)

[Chuanqi Xu via cfe-commits]

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@@ -1435,7 +1436,10 @@ class NonTypeTemplateParmDecl final
   bool hasDefaultArgument() const { return DefaultArgument.isSet(); }
 
   /// Retrieve the default argument, if any.
-  Expr *getDefaultArgument() const { return DefaultArgument.get(); }
+  const TemplateArgumentLoc &getDefaultArgument() const {
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ChuanqiXu9 wrote:

Is it better to rename `getDefaultArgument` to `getDefaultArgumentLoc`?

https://github.com/llvm/llvm-project/pull/92852