Uses double load/store on arm64, enables tests.

runtime/vm/constants_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.
 
 #ifndef VM_CONSTANTS_ARM64_H_
 #define VM_CONSTANTS_ARM64_H_
 
 #include "platform/assert.h"
 
 namespace dart {
@@ skipping 148 matching lines @@
     (1 << R18) | (1 << R19) | (1 << R20) | (1 << R21) |
     (1 << R22) | (1 << R23) | (1 << R24) | (1 << R25) |
     (1 << R26);
 
 // Registers available to Dart that are not preserved by runtime calls.
 const RegList kDartVolatileCpuRegs =
     kDartAvailableCpuRegs & ~kAbiPreservedCpuRegs;
 const Register kDartFirstVolatileCpuReg = R0;
 const Register kDartLastVolatileCpuReg = R18;
 const int kDartVolatileCpuRegCount = 17;  // Excluding R16 and R17.
-const VRegister kDartFirstVolatileFpuReg = V0;
-const VRegister kDartLastVolatileFpuReg = V7;
-const int kDartVolatileFpuRegCount = 8;
+const int kDartVolatileFpuRegCount = 24;
 
 static inline Register ConcreteRegister(Register r) {
   return ((r == ZR) || (r == SP)) ? R31 : r;
 }
 
 // Values for the condition field as defined in section A3.2.
 enum Condition {
   kNoCondition = -1,
   EQ =  0,  // equal
   NE =  1,  // not equal
@@ skipping 686 matching lines @@
   static Instr* At(uword pc) { return reinterpret_cast<Instr*>(pc); }
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Instr);
 };
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_ARM64_H_