[interpreter] Switch passing of new.target to register.

src/runtime/runtime-function.cc

Index: src/runtime/runtime-function.cc
diff --git a/src/runtime/runtime-function.cc b/src/runtime/runtime-function.cc
index 2df297b1d8d61f79192e82c73af04b008e251ace..2b637dcf2cc9408e87ad27ba04d1f864e899aa85 100644
--- a/src/runtime/runtime-function.cc
+++ b/src/runtime/runtime-function.cc
@@ -585,19 +585,6 @@ RUNTIME_FUNCTION(Runtime_Apply) {
 }
 
 
-RUNTIME_FUNCTION(Runtime_GetNewTarget) {
-  SealHandleScope shs(isolate);
-  DCHECK(args.length() == 0);
-  JavaScriptFrameIterator it(isolate);
-  JavaScriptFrame* frame = it.frame();
-  // TODO(4544): By now the runtime function is only used by the interpreter,
-  // get rid of the entire runtime function once the interpreter is switched.
-  DCHECK(!frame->is_optimized() && !frame->HasInlinedFrames());
-  return frame->IsConstructor() ? frame->GetNewTarget()
-                                : isolate->heap()->undefined_value();
-}
-
-
 // ES6 section 9.2.1.2, OrdinaryCallBindThis for sloppy callee.
 RUNTIME_FUNCTION(Runtime_ConvertReceiver) {
   HandleScope scope(isolate);