Reapply "Lazy deopt without code patching."

runtime/vm/instructions_x64.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.
 // Classes that describe assembly patterns as used by inline caches.
 
 #ifndef VM_INSTRUCTIONS_X64_H_
 #define VM_INSTRUCTIONS_X64_H_
 
 #ifndef VM_INSTRUCTIONS_H_
 #error Do not include instructions_ia32.h directly; use instructions.h instead.
@@ skipping 48 matching lines @@
     }
     return true;
   }
 
   const uword start_;
 
   DISALLOW_COPY_AND_ASSIGN(InstructionPattern);
 };
 
 
-// 5 byte call instruction.
-class ShortCallPattern : public InstructionPattern<ShortCallPattern> {
- public:
-  explicit ShortCallPattern(uword pc) : InstructionPattern(pc) {}
-
-  void SetTargetAddress(uword new_target) const;
-
-  static int pattern_length_in_bytes() { return kLengthInBytes; }
-  static const int* pattern() {
-    static const int kCallPattern[kLengthInBytes] = {0xE8, -1, -1, -1, -1};
-    return kCallPattern;
-  }
-
- private:
-  static const int kLengthInBytes = 5;
-  DISALLOW_COPY_AND_ASSIGN(ShortCallPattern);
-};
-
-
 class ReturnPattern : public InstructionPattern<ReturnPattern> {
  public:
   explicit ReturnPattern(uword pc) : InstructionPattern(pc) {}
 
   static const int* pattern() {
     static const int kReturnPattern[kLengthInBytes] = { 0xC3 };
     return kReturnPattern;
   }
 
   static int pattern_length_in_bytes() { return kLengthInBytes; }
@@ skipping 36 matching lines @@
 
   static int pattern_length_in_bytes() { return kLengthInBytes; }
 
  private:
   static const int kLengthInBytes = 3;
 };
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_X64_H_