Adds double load and store to arm64.

runtime/vm/assembler_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_ASSEMBLER_ARM64_H_
 #define VM_ASSEMBLER_ARM64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm64.h directly; use assembler.h instead.
 #endif
@@ skipping 605 matching lines @@
     EmitFPImm(FMOVDI, vd, imm8);
     return true;
   }
   void fmovdr(VRegister vd, Register rn) {
     EmitFPIntCvtOp(FMOVDR, static_cast<Register>(vd), rn);
   }
   void fmovrd(Register rd, VRegister vn) {
     EmitFPIntCvtOp(FMOVRD, rd, static_cast<Register>(vn));
   }
 
+  void fldrd(VRegister vt, Address a) {
+    ASSERT(a.type() != Address::PCOffset);
+    EmitLoadStoreReg(FLDR, static_cast<Register>(vt), a, kDoubleWord);
+  }
+  void fstrd(VRegister vt, Address a) {
+    ASSERT(a.type() != Address::PCOffset);
+    EmitLoadStoreReg(FSTR, static_cast<Register>(vt), a, kDoubleWord);
+  }
+
   // Aliases.
   void mov(Register rd, Register rn) {
     if ((rd == SP) || (rn == SP)) {
       add(rd, rn, Operand(0));
     } else {
       orr(rd, ZR, Operand(rn));
     }
   }
   void mvn(Register rd, Register rm) {
     orr(rd, ZR, Operand(rm));
@@ skipping 524 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM64_H_