[turbofan] Optimized support for CreateGeneratorObject.

src/compiler/js-operator.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/compiler/js-operator.h"
 
 #include <limits>
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
@@ skipping 886 matching lines @@
       parameters);                                          // parameter
 }
 
 const Operator* JSOperatorBuilder::DeleteProperty() {
   return new (zone()) Operator(                              // --
       IrOpcode::kJSDeleteProperty, Operator::kNoProperties,  // opcode
       "JSDeleteProperty",                                    // name
       3, 1, 1, 1, 1, 2);                                     // counts
 }
 
+const Operator* JSOperatorBuilder::CreateGeneratorObject() {
+  return new (zone()) Operator(                                     // --
+      IrOpcode::kJSCreateGeneratorObject, Operator::kEliminatable,  // opcode
+      "JSCreateGeneratorObject",                                    // name
+      2, 1, 1, 1, 1, 0);                                            // counts
+}
 
 const Operator* JSOperatorBuilder::LoadGlobal(const Handle<Name>& name,
                                               const VectorSlotPair& feedback,
                                               TypeofMode typeof_mode) {
   LoadGlobalParameters parameters(name, feedback, typeof_mode);
   return new (zone()) Operator1<LoadGlobalParameters>(   // --
       IrOpcode::kJSLoadGlobal, Operator::kNoProperties,  // opcode
       "JSLoadGlobal",                                    // name
       0, 1, 1, 1, 1, 2,                                  // counts
       parameters);                                       // parameter
@@ skipping 163 matching lines @@
   return new (zone()) Operator1<Handle<ScopeInfo>>(               // --
       IrOpcode::kJSCreateScriptContext, Operator::kNoProperties,  // opcode
       "JSCreateScriptContext",                                    // name
       1, 1, 1, 1, 1, 2,                                           // counts
       scope_info);                                                // parameter
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8