[turbofan] extend escape analysis to reduce CheckMaps

src/compiler/escape-analysis-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_ESCAPE_ANALYSIS_REDUCER_H_
 #define V8_COMPILER_ESCAPE_ANALYSIS_REDUCER_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/bit-vector.h"
 #include "src/compiler/escape-analysis.h"
@@ skipping 18 matching lines @@
   // Verifies that all virtual allocation nodes have been dealt with. Run it
   // after this reducer has been applied. Has no effect in release mode.
   void VerifyReplacement() const;
 
   bool compilation_failed() const { return compilation_failed_; }
 
  private:
   Reduction ReduceNode(Node* node);
   Reduction ReduceLoad(Node* node);
   Reduction ReduceStore(Node* node);
+  Reduction ReduceCheckMaps(Node* node);
   Reduction ReduceAllocate(Node* node);
   Reduction ReduceFinishRegion(Node* node);
   Reduction ReduceReferenceEqual(Node* node);
   Reduction ReduceObjectIsSmi(Node* node);
   Reduction ReduceFrameStateUses(Node* node);
   Node* ReduceDeoptState(Node* node, Node* effect, bool multiple_users);
   Node* ReduceStateValueInput(Node* node, int node_index, Node* effect,
                               bool node_multiused, bool already_cloned,
                               bool multiple_users);
 
@@ skipping 11 matching lines @@
   bool compilation_failed_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(EscapeAnalysisReducer);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ESCAPE_ANALYSIS_REDUCER_H_