VM: Emit compacter code for x64 branches to external labels.

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 38 matching lines @@
   // array of integers 'data'. 'data' elements are either a byte or -1, which
   // represents any byte.
   bool TestBytesWith(const int* data, int num_bytes) const;
 
   const uword start_;
 
   DISALLOW_COPY_AND_ASSIGN(InstructionPattern);
 };
 
 
-class CallPattern : public InstructionPattern {
- public:
-  CallPattern(uword pc, const Code& code)
-      : InstructionPattern(pc),
-        code_(code) {}
-  static int InstructionLength() {
-    return kLengthInBytes;
-  }
-  uword TargetAddress() const;
-  void SetTargetAddress(uword new_target) const;
-  virtual int pattern_length_in_bytes() const {
-    return kLengthInBytes;
-  }
-
- private:
-  static const int kLengthInBytes = 13;
-  virtual const int* pattern() const;
-  const Code& code_;
-
-  DISALLOW_COPY_AND_ASSIGN(CallPattern);
-};
-
-
 class JumpPattern : public InstructionPattern {
  public:
   JumpPattern(uword pc, const Code& code)
       : InstructionPattern(pc),
         object_pool_(Array::Handle(code.ObjectPool())) {}
   static int InstructionLength() {
     return kLengthInBytes;
   }
   uword TargetAddress() const;
   void SetTargetAddress(uword new_target) const;
   virtual int pattern_length_in_bytes() const {
     return kLengthInBytes;
   }
 
+  static const int kLengthInBytes = 7;
  private:
-  static const int kLengthInBytes = 10;
   virtual const int* pattern() const;
   const Array& object_pool_;
 
   DISALLOW_COPY_AND_ASSIGN(JumpPattern);
 };
 
 
 // 5 byte call instruction.
 class ShortCallPattern : public InstructionPattern {
  public:
@@ skipping 12 matching lines @@
   static const int kLengthInBytes = 5;
   virtual const int* pattern() const;
 
   DISALLOW_COPY_AND_ASSIGN(ShortCallPattern);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INSTRUCTIONS_X64_H_