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

src/runtime/runtime-function.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/accessors.h"
 #include "src/arguments.h"
 #include "src/compiler.h"
 #include "src/deoptimizer.h"
@@ skipping 572 matching lines @@
       isolate, result, Execution::Call(isolate, fun, receiver, argc, argv));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(Runtime_GetNewTarget) {
   SealHandleScope shs(isolate);
   DCHECK(args.length() == 0);
   JavaScriptFrameIterator it(isolate);
   JavaScriptFrame* frame = it.frame();
-  // TODO(4544): Currently we never inline any [[Construct]] calls where the
-  // actual target differs from the new target. Fix this soon!
-  if (frame->HasInlinedFrames()) {
-    HandleScope scope(isolate);
-    List<FrameSummary> frames(FLAG_max_inlining_levels + 1);
-    it.frame()->Summarize(&frames);
-    FrameSummary& summary = frames.last();
-    return summary.is_constructor() ? Object::cast(*summary.function())
-                                    : isolate->heap()->undefined_value();
-  }
+  // 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);
   DCHECK(args.length() == 1);
   CONVERT_ARG_HANDLE_CHECKED(Object, receiver, 0);
@@ skipping 25 matching lines @@
 
 RUNTIME_FUNCTION(Runtime_ThrowStrongModeTooFewArguments) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 0);
   THROW_NEW_ERROR_RETURN_FAILURE(isolate,
                                  NewTypeError(MessageTemplate::kStrongArity));
 }
 
 }  // namespace internal
 }  // namespace v8