[Interpreter] Add support for JS calls.

src/compiler/typer.cc

Index: src/compiler/typer.cc
diff --git a/src/compiler/typer.cc b/src/compiler/typer.cc
index 594e4bd61369e5b0caa6830127ab211a698722ed..c5008220a0cf53315f9adb38614a881093bc49d3 100644
--- a/src/compiler/typer.cc
+++ b/src/compiler/typer.cc
@@ -609,6 +609,11 @@ Bounds Typer::Visitor::TypeCall(Node* node) {
 }
 
 
+Bounds Typer::Visitor::TypeCallVarArgs(Node* node) {
+  return Bounds::Unbounded();
+}
+
+
 Bounds Typer::Visitor::TypeProjection(Node* node) {
   // TODO(titzer): use the output type of the input to determine the bounds.
   return Bounds::Unbounded();