Make generators non-constructable.

src/globals.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_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 1006 matching lines @@
 
 
 inline bool IsClassConstructor(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kClassConstructor;
 }
 
 
 inline bool IsConstructable(FunctionKind kind, LanguageMode mode) {
   if (IsAccessorFunction(kind)) return false;
-  if (IsConciseMethod(kind) && !IsGeneratorFunction(kind)) return false;
+  if (IsConciseMethod(kind)) return false;
   if (IsArrowFunction(kind)) return false;
+  if (IsGeneratorFunction(kind)) return false;
   if (is_strong(mode)) return IsClassConstructor(kind);
   return true;
 }
 
 
 inline bool IsInObjectLiteral(FunctionKind kind) {
   DCHECK(IsValidFunctionKind(kind));
   return kind & FunctionKind::kInObjectLiteral;
 }
 
 
 inline FunctionKind WithObjectLiteralBit(FunctionKind kind) {
   kind = static_cast<FunctionKind>(kind | FunctionKind::kInObjectLiteral);
   DCHECK(IsValidFunctionKind(kind));
   return kind;
 }
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_