[turbofan] Introduce JSStackCheck operator.

src/compiler/js-operator.h

 // Copyright 2013 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_COMPILER_JS_OPERATOR_H_
 #define V8_COMPILER_JS_OPERATOR_H_
 
 #include "src/runtime/runtime.h"
 #include "src/unique.h"
 
@@ skipping 236 matching lines @@
 
   const Operator* HasProperty();
 
   const Operator* LoadContext(size_t depth, size_t index, bool immutable);
   const Operator* StoreContext(size_t depth, size_t index);
 
   const Operator* TypeOf();
   const Operator* InstanceOf();
   const Operator* Debugger();
 
+  const Operator* StackCheck();
+
   // TODO(titzer): nail down the static parts of each of these context flavors.
   const Operator* CreateFunctionContext();
   const Operator* CreateCatchContext(const Unique<String>& name);
   const Operator* CreateWithContext();
   const Operator* CreateBlockContext();
   const Operator* CreateModuleContext();
   const Operator* CreateScriptContext();
 
  private:
   Zone* zone() const { return zone_; }
 
   const JSOperatorGlobalCache& cache_;
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(JSOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_OPERATOR_H_