[es6] Fix tail Call nodes marking.

src/ast/prettyprinter.cc

Index: src/ast/prettyprinter.cc
diff --git a/src/ast/prettyprinter.cc b/src/ast/prettyprinter.cc
index 5764267e832e9b732d2dd0484f72084446e720e1..3f624be864878428e16e6d30314e2091848b7bd0 100644
--- a/src/ast/prettyprinter.cc
+++ b/src/ast/prettyprinter.cc
@@ -1608,7 +1608,9 @@ void AstPrinter::VisitProperty(Property* node) {
 
 void AstPrinter::VisitCall(Call* node) {
   EmbeddedVector<char, 128> buf;
-  FormatSlotNode(&buf, node, "CALL", node->CallFeedbackICSlot());
+  const char* name =
+      node->tail_call_mode() == TailCallMode::kAllow ? "TAIL CALL" : "CALL";
+  FormatSlotNode(&buf, node, name, node->CallFeedbackICSlot());
   IndentedScope indent(this, buf.start());
 
   Visit(node->expression());