[clang] [clang] Improve ast-dumper text printing of TemplateArgument (PR #93431)

[Aaron Ballman via cfe-commits]

================
@@ -947,6 +947,26 @@ void TextNodeDumper::dumpDeclRef(const Decl *D, StringRef 
Label) {
   });
 }
 
+void TextNodeDumper::dumpTemplateArgument(const TemplateArgument &TA) {
+  llvm::SmallString<128> Str;
+  {
+    llvm::raw_svector_ostream SS(Str);
+    TA.print(PrintPolicy, SS, /*IncludeType=*/true);
+  }
+  OS << " '" << Str << "'";
+
+  if (TemplateArgument CanonTA = Context->getCanonicalTemplateArgument(TA);
----------------
AaronBallman wrote:

```suggestion
  if (const TemplateArgument &CanonTA = 
Context->getCanonicalTemplateArgument(TA);
```

https://github.com/llvm/llvm-project/pull/93431
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