Adds far-branches to arm64.

tests/lib/math/double_pow_test.dart

 // Copyright (c) 2011, 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.
 // VMOptions=--optimization-counter-threshold=5
 
 library math_test;
 import "package:expect/expect.dart";
 import 'dart:math';
 
 void checkVeryClose(double a, double b) {
   // We find a ulp (unit in the last place) by shifting the original number
   // to the right. This only works if we are not too close to infinity or if
   // we work with denormals.
-  // We special case or 0.0, but not for infinity.
+  // We special case for 0.0, but not for infinity.
   if (a == 0.0) {
     final minimalDouble = 4.9406564584124654e-324;
     Expect.equals(true, b.abs() <= minimalDouble);
     return;
   }
   if (b == 0.0) {
     // No need to look if they are close. Otherwise the check for 'a' above
-    // whould have triggered.
+    // would have triggered.
     Expect.equals(a, b);
   }
   final double shiftRightBy52 = 2.220446049250313080847263336181640625e-16;
   final double shiftedA = (a * shiftRightBy52).abs();
   // Compared to 'a', 'shiftedA' is now ~1-2 ulp.
 
   final double limitLow = a - shiftedA;
   final double limitHigh = a + shiftedA;
   Expect.equals(false, a == limitLow);
   Expect.equals(false, a == limitHigh);
@@ skipping 120 matching lines @@
   // Conversion to double.
 
   // The second argument is an odd integer as int, but not when converted
   // to double.
   Expect.identical(Infinity, pow(-0.0, -9223372036854775809));
 }
 
 main() {
   for (int i = 0; i < 10; i++) test();
 }