[arm, arm64] Implemented unaligned scalar float access.

tests/language/vm/unaligned_float_access_literal_index_test.dart

 // Copyright (c) 2016, 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=10 --no-background_compilation
 
 import 'dart:typed_data';
 import 'package:expect/expect.dart';
 
 unalignedFloat32() {
   var bytes = new ByteData(64);
-  bytes.setFloat32(0, 16.25);
-  Expect.equals(16.25, bytes.getFloat32(0));
-  bytes.setFloat32(1, 32.125);
-  Expect.equals(32.125, bytes.getFloat32(1));
-  bytes.setFloat32(2, 16.25);
-  Expect.equals(16.25, bytes.getFloat32(2));
-  bytes.setFloat32(3, 32.125);
-  Expect.equals(32.125, bytes.getFloat32(3));
+  bytes.setFloat32(0, 16.25, Endianness.HOST_ENDIAN);
+  Expect.equals(16.25, bytes.getFloat32(0, Endianness.HOST_ENDIAN));
+  bytes.setFloat32(1, 32.125, Endianness.HOST_ENDIAN);
+  Expect.equals(32.125, bytes.getFloat32(1, Endianness.HOST_ENDIAN));
+  bytes.setFloat32(2, 16.25, Endianness.HOST_ENDIAN);
+  Expect.equals(16.25, bytes.getFloat32(2, Endianness.HOST_ENDIAN));
+  bytes.setFloat32(3, 32.125, Endianness.HOST_ENDIAN);
+  Expect.equals(32.125, bytes.getFloat32(3, Endianness.HOST_ENDIAN));
 }
 
 unalignedFloat64() {
   var bytes = new ByteData(64);
-  bytes.setFloat64(0, 16.25);
-  Expect.equals(16.25, bytes.getFloat64(0));
-  bytes.setFloat64(1, 32.125);
-  Expect.equals(32.125, bytes.getFloat64(1));
-  bytes.setFloat64(2, 16.25);
-  Expect.equals(16.25, bytes.getFloat64(2));
-  bytes.setFloat64(3, 32.125);
-  Expect.equals(32.125, bytes.getFloat64(3));
-  bytes.setFloat64(4, 16.25);
-  Expect.equals(16.25, bytes.getFloat64(4));
-  bytes.setFloat64(5, 32.125);
-  Expect.equals(32.125, bytes.getFloat64(5));
-  bytes.setFloat64(6, 16.25);
-  Expect.equals(16.25, bytes.getFloat64(6));
-  bytes.setFloat64(7, 32.125);
-  Expect.equals(32.125, bytes.getFloat64(7));
+  bytes.setFloat64(0, 16.25, Endianness.HOST_ENDIAN);
+  Expect.equals(16.25, bytes.getFloat64(0, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(1, 32.125, Endianness.HOST_ENDIAN);
+  Expect.equals(32.125, bytes.getFloat64(1, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(2, 16.25, Endianness.HOST_ENDIAN);
+  Expect.equals(16.25, bytes.getFloat64(2, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(3, 32.125, Endianness.HOST_ENDIAN);
+  Expect.equals(32.125, bytes.getFloat64(3, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(4, 16.25, Endianness.HOST_ENDIAN);
+  Expect.equals(16.25, bytes.getFloat64(4, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(5, 32.125, Endianness.HOST_ENDIAN);
+  Expect.equals(32.125, bytes.getFloat64(5, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(6, 16.25, Endianness.HOST_ENDIAN);
+  Expect.equals(16.25, bytes.getFloat64(6, Endianness.HOST_ENDIAN));
+  bytes.setFloat64(7, 32.125, Endianness.HOST_ENDIAN);
+  Expect.equals(32.125, bytes.getFloat64(7, Endianness.HOST_ENDIAN));
 }
 
 main() {
   for (var i = 0; i < 20; i++) {
     unalignedFloat32();
     unalignedFloat64();
   }
 }