Reapply "Deoptimization support in inlined code."

runtime/vm/intrinsifier.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Class for intrinsifying functions.
 
 #ifndef VM_INTRINSIFIER_H_
 #define VM_INTRINSIFIER_H_
 
 #include "vm/allocation.h"
 
@@ skipping 76 matching lines @@
 // Forward declarations.
 class Assembler;
 class Function;
 
 class Intrinsifier : public AllStatic {
  public:
   // Try to intrinsify 'function'. Returns true if the function intrinsified
   // completely and the code does not need to be generated (i.e., no slow
   // path possible).
   static bool Intrinsify(const Function& function, Assembler* assembler);
+  static bool CanIntrinsify(const Function& function);
 
  private:
 #define DECLARE_FUNCTION(test_class_name, test_function_name, destination)    \
   static bool destination(Assembler* assembler);
 
 INTRINSIC_LIST(DECLARE_FUNCTION)
 #undef DECLARE_FUNCTION
 };
 
 }  // namespace dart
 
 #endif  // VM_INTRINSIFIER_H_