[ASTDump] Add is_anonymous to VisitCXXRecordDecl

Summary:
Adding is_anonymous the ASTDump for CXXRecordDecl. This turned out to be useful when debugging some problems with how LLDB creates ASTs from DWARF.

Differential Revision: https://reviews.llvm.org/D66028

llvm-svn: 368591
diff --git a/clang/lib/AST/TextNodeDumper.cpp b/clang/lib/AST/TextNodeDumper.cpp
index cba9091..df3d149 100644
--- a/clang/lib/AST/TextNodeDumper.cpp
+++ b/clang/lib/AST/TextNodeDumper.cpp
@@ -1537,6 +1537,7 @@
     FLAG(isGenericLambda, generic);
     FLAG(isLambda, lambda);
 
+    FLAG(isAnonymousStructOrUnion, is_anonymous);
     FLAG(canPassInRegisters, pass_in_registers);
     FLAG(isEmpty, empty);
     FLAG(isAggregate, aggregate);