Introduce a BuiltinsConstructStub that sets up new.target and does a [[call]] per ES6 9.3.2

src/heap/heap.h

 // Copyright 2012 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.
 
 #ifndef V8_HEAP_HEAP_H_
 #define V8_HEAP_HEAP_H_
 
 #include <cmath>
 #include <map>
 
@@ skipping 270 matching lines @@
   V(nan_string, "NaN")                                           \
   V(next_string, "next")                                         \
   V(null_string, "null")                                         \
   V(number_string, "number")                                     \
   V(Number_string, "Number")                                     \
   V(object_string, "object")                                     \
   V(Object_string, "Object")                                     \
   V(ownKeys_string, "ownKeys")                                   \
   V(preventExtensions_string, "preventExtensions")               \
   V(private_api_string, "private_api")                           \
+  V(Promise_string, "Promise")                                   \
   V(proto_string, "__proto__")                                   \
   V(prototype_string, "prototype")                               \
   V(query_colon_string, "(?:)")                                  \
   V(RegExp_string, "RegExp")                                     \
   V(setPrototypeOf_string, "setPrototypeOf")                     \
   V(set_string, "set")                                           \
   V(Set_string, "Set")                                           \
   V(source_mapping_url_string, "source_mapping_url")             \
   V(source_string, "source")                                     \
   V(source_url_string, "source_url")                             \
@@ skipping 2422 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_HEAP_HEAP_H_