[es6] [interpreter] Add tail calls support to Ignition.

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index 4783fef2c7cea76dd71459223b963ef4a2eb928e..6a65eb51ba9ab078be8db420aefc4d4f796dc303 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -84,7 +84,8 @@ class InterpreterAssembler : public compiler::CodeStubAssembler {
   // arguments (not including receiver) and the first argument
   // located at |first_arg|.
   compiler::Node* CallJS(compiler::Node* function, compiler::Node* context,
-                         compiler::Node* first_arg, compiler::Node* arg_count);
+                         compiler::Node* first_arg, compiler::Node* arg_count,
+                         TailCallMode tail_call_mode);
 
   // Call constructor |constructor| with |arg_count| arguments (not
   // including receiver) and the first argument located at