[clang][AST] TextNodeDumper learned to output instantiated_from information

Reviewed By: aaron.ballman

Differential Revision: https://reviews.llvm.org/D158165

Author: strimo378

clang/lib/AST/TextNodeDumper.cpp

@@ -1892,6 +1892,11 @@ void TextNodeDumper::VisitFunctionDecl(const FunctionDecl *D) {
   // ParmVarDecls yet.
   if (!D->param_empty() && !D->param_begin())
     OS << " <<<NULL params x " << D->getNumParams() << ">>>";
+
+  if (const auto *Instance = D->getInstantiatedFromMemberFunction()) {
+    OS << " instantiated_from";
+    dumpPointer(Instance);
+  }
 }
 
 void TextNodeDumper::VisitLifetimeExtendedTemporaryDecl(
@@ -2107,6 +2112,10 @@ void TextNodeDumper::VisitTypeAliasTemplateDecl(
 
 void TextNodeDumper::VisitCXXRecordDecl(const CXXRecordDecl *D) {
   VisitRecordDecl(D);
+  if (const auto *Instance = D->getInstantiatedFromMemberClass()) {
+    OS << " instantiated_from";
+    dumpPointer(Instance);
+  }
   if (const auto *CTSD = dyn_cast<ClassTemplateSpecializationDecl>(D))
     dumpTemplateSpecializationKind(CTSD->getSpecializationKind());