Adds intrinsics for Float64Array [] and []=.

runtime/vm/assembler_x64.h

 // Copyright (c) 2013, 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.
 
 #ifndef VM_ASSEMBLER_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 866 matching lines @@
   void Unimplemented(const char* message);
   void Untested(const char* message);
   void Unreachable(const char* message);
 
   static void InitializeMemoryWithBreakpoints(uword data, intptr_t length);
 
   static const char* RegisterName(Register reg);
 
   static const char* FpuRegisterName(FpuRegister reg);
 
+  static Address ElementAddressForIntIndex(bool is_external,
+                                           intptr_t cid,
+                                           intptr_t index_scale,
+                                           Register array,
+                                           intptr_t index);
+  static Address ElementAddressForRegIndex(bool is_external,
+                                           intptr_t cid,
+                                           intptr_t index_scale,
+                                           Register array,
+                                           Register index);
+
   // On some other platforms, we draw a distinction between safe and unsafe
   // smis.
   static bool IsSafe(const Object& object) { return true; }
   static bool IsSafeSmi(const Object& object) { return object.IsSmi(); }
 
  private:
   AssemblerBuffer buffer_;
 
   // Objects and jump targets.
   GrowableObjectArray& object_pool_;
@@ skipping 187 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_