[turbofan] Optimized support for CreateGeneratorObject.

src/compiler/operator-properties.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/operator-properties.h"
 
 #include "src/compiler/js-operator.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
 
@@ skipping 16 matching lines @@
       return true;
     case IrOpcode::kJSCallRuntime: {
       const CallRuntimeParameters& p = CallRuntimeParametersOf(op);
       return Linkage::NeedsFrameStateInput(p.id());
     }
 
     // Strict equality cannot lazily deoptimize.
     case IrOpcode::kJSStrictEqual:
       return false;
 
+    // Generator creation cannot call back into arbitrary JavaScript.
+    case IrOpcode::kJSCreateGeneratorObject:
+      return false;
+
     // Binary operations
     case IrOpcode::kJSAdd:
     case IrOpcode::kJSSubtract:
     case IrOpcode::kJSMultiply:
     case IrOpcode::kJSDivide:
     case IrOpcode::kJSModulus:
 
     // Bitwise operations
     case IrOpcode::kJSBitwiseOr:
     case IrOpcode::kJSBitwiseXor:
@@ skipping 80 matching lines @@
          opcode == IrOpcode::kDead || opcode == IrOpcode::kLoop ||
          opcode == IrOpcode::kMerge || opcode == IrOpcode::kIfTrue ||
          opcode == IrOpcode::kIfFalse || opcode == IrOpcode::kIfSuccess ||
          opcode == IrOpcode::kIfException || opcode == IrOpcode::kIfValue ||
          opcode == IrOpcode::kIfDefault;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8