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

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index ee95243eb86ba556c22dddf722d3454f8f36d336..a4f8e1c6d11240383334ee14e397c2c553dde4e4 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -3989,6 +3989,16 @@ Handle<Code> Builtins::CallBoundFunction(TailCallMode tail_call_mode) {
   return Handle<Code>::null();
 }
 
+Handle<Code> Builtins::InterpreterPushArgsAndCall(TailCallMode tail_call_mode) {
+  switch (tail_call_mode) {
+    case TailCallMode::kDisallow:
+      return InterpreterPushArgsAndCall();
+    case TailCallMode::kAllow:
+      return InterpreterPushArgsAndTailCall();
+  }
+  UNREACHABLE();
+  return Handle<Code>::null();
+}
 
 namespace {