[Concepts] Dump template arguments for immediately declared constraint.

The template arguments were dumped as part of the TemplateTypeParmDecl, which
was incorrect.

Differential Revision: https://reviews.llvm.org/D85282

Author: hokein

clang/include/clang/AST/ASTNodeTraverser.h

@@ -543,9 +543,7 @@ class ASTNodeTraverser
 
   void VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
     if (const auto *TC = D->getTypeConstraint())
-      if (TC->hasExplicitTemplateArgs())
-        for (const auto &ArgLoc : TC->getTemplateArgsAsWritten()->arguments())
-          dumpTemplateArgumentLoc(ArgLoc);
+      Visit(TC->getImmediatelyDeclaredConstraint());
     if (D->hasDefaultArgument())
       Visit(D->getDefaultArgument(), SourceRange(),
             D->getDefaultArgStorage().getInheritedFrom(),
@@ -574,6 +572,12 @@ class ASTNodeTraverser
     Visit(D->getConstraintExpr());
   }
 
+  void VisitConceptSpecializationExpr(const ConceptSpecializationExpr *CSE) {
+    if (CSE->hasExplicitTemplateArgs())
+      for (const auto &ArgLoc : CSE->getTemplateArgsAsWritten()->arguments())
+        dumpTemplateArgumentLoc(ArgLoc);
+  }
+
   void VisitUsingShadowDecl(const UsingShadowDecl *D) {
     if (auto *TD = dyn_cast<TypeDecl>(D->getUnderlyingDecl()))
       Visit(TD->getTypeForDecl());

clang/lib/AST/TextNodeDumper.cpp

@@ -1999,7 +1999,6 @@ void TextNodeDumper::VisitTemplateTypeParmDecl(const TemplateTypeParmDecl *D) {
       dumpBareDeclRef(TC->getFoundDecl());
       OS << ")";
     }
-    AddChild([=] { Visit(TC->getImmediatelyDeclaredConstraint()); });
   } else if (D->wasDeclaredWithTypename())
     OS << " typename";
   else

clang/test/AST/ast-dump-concepts.cpp

@@ -15,8 +15,12 @@ concept binary_concept = true;
 template <typename T>
 struct Foo {
   // CHECK:      TemplateTypeParmDecl {{.*}} referenced Concept {{.*}} 'binary_concept'
-  // CHECK-NEXT: |-ConceptSpecializationExpr {{.*}} <col:13, col:31> 'bool' Concept {{.*}} 'binary_concept'
-  // CHECK-NEXT: `-TemplateArgument {{.*}} type 'int'
+  // CHECK-NEXT: `-ConceptSpecializationExpr {{.*}} <col:13, col:31> 'bool' Concept {{.*}} 'binary_concept'
+  // CHECK-NEXT:   |-TemplateArgument {{.*}} type 'R'
+  // CHECK-NEXT:   | `-TemplateTypeParmType {{.*}} 'R'
+  // CHECK-NEXT:   |   `-TemplateTypeParm {{.*}} 'R'
+  // CHECK-NEXT:   `-TemplateArgument {{.*}} type 'int'
+  // CHECK-NEXT:     `-BuiltinType {{.*}} 'int'
   template <binary_concept<int> R>
   Foo(R);
 
@@ -25,11 +29,11 @@ struct Foo {
   template <unary_concept R>
   Foo(R);
 
-  // CHECK:      FunctionTemplateDecl {{.*}} <line:29:3, line:30:39> {{.*}} Foo<T>
+  // CHECK:      FunctionTemplateDecl {{.*}} <line:[[@LINE+1]]:3, line:[[@LINE+2]]:39> {{.*}} Foo<T>
   template <typename R>
   Foo(R, int) requires unary_concept<R>;
 
-  // CHECK:      FunctionTemplateDecl {{.*}} <line:33:3, line:35:3> {{.*}} Foo<T>
+  // CHECK:      FunctionTemplateDecl {{.*}} <line:[[@LINE+1]]:3, line:[[@LINE+3]]:3> {{.*}} Foo<T>
   template <typename R>
   Foo(R, char) requires unary_concept<R> {
   }