[turbofan] Introduce CheckIf simplified operator.

src/compiler/js-call-reducer.h

 // Copyright 2015 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_CALL_REDUCER_H_
 #define V8_COMPILER_JS_CALL_REDUCER_H_
 
 #include "src/base/flags.h"
 #include "src/compiler/graph-reducer.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
 // Forward declarations.
 class CommonOperatorBuilder;
 class JSGraph;
 class JSOperatorBuilder;
-
+class SimplifiedOperatorBuilder;
 
 // Performs strength reduction on {JSCallConstruct} and {JSCallFunction} nodes,
 // which might allow inlining or other optimizations to be performed afterwards.
 class JSCallReducer final : public Reducer {
  public:
   // Flags that control the mode of operation.
   enum Flag {
     kNoFlags = 0u,
     kDeoptimizationEnabled = 1u << 0,
   };
@@ skipping 15 matching lines @@
 
   MaybeHandle<Context> GetNativeContext(Node* node);
 
   Graph* graph() const;
   Flags flags() const { return flags_; }
   JSGraph* jsgraph() const { return jsgraph_; }
   Isolate* isolate() const;
   MaybeHandle<Context> native_context() const { return native_context_; }
   CommonOperatorBuilder* common() const;
   JSOperatorBuilder* javascript() const;
+  SimplifiedOperatorBuilder* simplified() const;
 
   JSGraph* const jsgraph_;
   Flags const flags_;
   MaybeHandle<Context> const native_context_;
 };
 
 DEFINE_OPERATORS_FOR_FLAGS(JSCallReducer::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_JS_CALL_REDUCER_H_