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

[Matheus Izvekov via cfe-commits]

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@@ -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);
+      !CanonTA.structurallyEquals(TA)) {
+    llvm::SmallString<128> CanonStr;
+    {
+      llvm::raw_svector_ostream SS(CanonStr);
+      CanonTA.print(PrintPolicy, SS, /*IncludeType=*/true);
+    }
+    if (CanonStr != Str)
+      OS << ":'" << CanonStr << "'";
+  }
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mizvekov wrote:

This starts showing up in tests after the improvements in https://github.com/llvm/llvm-project/pull/93433,
which is stacked on top of this PR.

Take a look at some of the modified AST tests there.

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