[es6] implement spread calls

src/prettyprinter.cc

Index: src/prettyprinter.cc
diff --git a/src/prettyprinter.cc b/src/prettyprinter.cc
index 165e71721228ce6abae4820d27c50c52d53072d2..78b73d6add58dfe9aa738e238787011dab6ceb30 100644
--- a/src/prettyprinter.cc
+++ b/src/prettyprinter.cc
@@ -375,6 +375,13 @@ void CallPrinter::VisitCompareOperation(CompareOperation* node) {
 }
 
 
+void CallPrinter::VisitSpread(Spread* node) {
+  Print("(...");
+  Find(node->expression(), true);
+  Print(")");
+}
+
+
 void CallPrinter::VisitThisFunction(ThisFunction* node) {}
 
 
@@ -870,6 +877,13 @@ void PrettyPrinter::VisitCompareOperation(CompareOperation* node) {
 }
 
 
+void PrettyPrinter::VisitSpread(Spread* node) {
+  Print("(...");
+  Visit(node->expression());
+  Print(")");
+}
+
+
 void PrettyPrinter::VisitThisFunction(ThisFunction* node) {
   Print("<this-function>");
 }
@@ -1573,6 +1587,12 @@ void AstPrinter::VisitCompareOperation(CompareOperation* node) {
 }
 
 
+void AstPrinter::VisitSpread(Spread* node) {
+  IndentedScope indent(this, "...");
+  Visit(node->expression());
+}
+
+
 void AstPrinter::VisitThisFunction(ThisFunction* node) {
   IndentedScope indent(this, "THIS-FUNCTION");
 }