Reapply "Lazy deopt without code patching."

runtime/vm/instructions_dbc.h

 // Copyright (c) 2016, 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.
 // Classes that describe assembly patterns as used by inline caches.
 
 #ifndef VM_INSTRUCTIONS_DBC_H_
 #define VM_INSTRUCTIONS_DBC_H_
 
 #ifndef VM_INSTRUCTIONS_H_
 #error Do not include instructions_dbc.h directly; use instructions.h instead.
@@ skipping 39 matching lines @@
 
 class CallPattern : public ValueObject {
  public:
   CallPattern(uword pc, const Code& code);
 
   RawICData* IcData();
 
   RawCode* TargetCode() const;
   void SetTargetCode(const Code& code) const;
 
-  // This constant length is only valid for inserted call patterns used for
-  // lazy deoptimization. Regular call pattern may vary in length.
-  static int DeoptCallPatternLengthInBytes();
-  static int DeoptCallPatternLengthInInstructions();
-
-  static void InsertDeoptCallAt(uword pc, uword target_address);
+  static void InsertDeoptCallAt(uword pc);
 
  private:
   const ObjectPool& object_pool_;
 
   uword end_;
   uword ic_data_load_end_;
 
   intptr_t target_code_pool_index_;
   ICData& ic_data_;
 
@@ skipping 58 matching lines @@
 
   bool IsValid() const;
 
  private:
   const uword pc_;
 };
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_DBC_H_