Adds unary double operations to ARM64, enables many tests.

runtime/vm/disassembler_arm64.cc

 // 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.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_ARM64.
 #if defined(TARGET_ARCH_ARM64)
 #include "platform/assert.h"
 
@@ skipping 975 matching lines @@
 }
 
 
 void ARM64Decoder::DecodeFPOneSource(Instr* instr) {
   const int opc = instr->Bits(15, 2);
 
   switch (opc) {
     case 0:
       Format(instr, "fmovdd 'vd, 'vn");
       break;
+    case 1:
+      Format(instr, "fabsd 'vd, 'vn");
+      break;
+    case 2:
+      Format(instr, "fnegd 'vd, 'vn");
+      break;
+    case 3:
+      Format(instr, "fsqrtd 'vd, 'vn");
+      break;
     default:
-      Unknown(instr);
+      UNREACHABLE();
       break;
   }
 }
 
 
 void ARM64Decoder::DecodeFPTwoSource(Instr* instr) {
   if (instr->Bits(22, 2) != 1) {
     Unknown(instr);
     return;
   }
@@ skipping 122 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM