Adds arm64 double arithmetic instructions.

runtime/vm/simulator_arm64.h

 // Copyright (c) 2014, 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.
 
 // Declares a Simulator for ARM64 instructions if we are not generating a native
 // ARM64 binary. This Simulator allows us to run and debug ARM64 code generation
 // on regular desktop machines.
 // Dart calls into generated code by "calling" the InvokeDartCode stub,
 // which will start execution in the Simulator or forwards to the real entry
 // on a ARM64 HW platform.
@@ skipping 102 matching lines @@
   static const uword kEndSimulatingPC = -2;
 
   // CPU state.
   int64_t registers_[kNumberOfCpuRegisters];
   bool n_flag_;
   bool z_flag_;
   bool c_flag_;
   bool v_flag_;
 
   simd_value_t vregisters_[kNumberOfVRegisters];
-  bool fp_n_flag_;
-  bool fp_z_flag_;
-  bool fp_c_flag_;
-  bool fp_v_flag_;
 
   // Simulator support.
   int64_t last_pc_;
   int64_t pc_;
   char* stack_;
   bool pc_modified_;
   intptr_t icount_;
   static int64_t flag_stop_sim_at_;
   SimulatorSetjmpBuffer* last_setjmp_buffer_;
   uword top_exit_frame_info_;
@@ skipping 83 matching lines @@
   }
 
   friend class SimulatorDebugger;
   friend class SimulatorSetjmpBuffer;
   DISALLOW_COPY_AND_ASSIGN(Simulator);
 };
 
 }  // namespace dart
 
 #endif  // VM_SIMULATOR_ARM64_H_