Support reusable boxes for Float32x4 fields

tests/language/vm/reusable_boxes_test.dart

+// Copyright (c) 2013, 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.
+// Test correct handling reusable boxes.
+// VMOptions=--optimization_counter_threshold=100
+
+library reusable_boxes_test;
+
+import 'dart:typed_data';
+
+class D {
+  var a = 0.0;
+  var b = 1.0;
+  var c = 2.0;
+  test() {
+    a = 0.0;
+    b = 1.0;
+    c = a + b;
+  }
+
+  testParam(x, y) {
+    x = x * x;
+    y = y * y;
+    c = x + y;
+  }
+}
+
+testD() {
+  var f = new D();
+  for (var i = 0; i < 20; i++) {
+    f.test();
+  }
+  // Trigger a deopt of test.
+  f.testParam(new Float32x4(1.0, 2.0, 3.0, 4.0), new Float32x4.zero());
+  for (var i = 0; i < 20; i++) {
+    f.test();

[Florian Schneider, 2014/02/06 12:38:49]

Maybe return a value to check from test(), or check that f.c contains the
correct value afterwards.

[Cutch, 2014/02/06 23:15:38]

Done.

+  }
+}
+
+
+class F {
+  var a = new Float32x4.zero();
+  var b = new Float32x4(1.0, 2.0, 3.0, 4.0);
+  var c = new Float32x4.zero();
+  test() {
+    a = new Float32x4.zero();
+    b = new Float32x4(1.0, 2.0, 3.0, 4.0);
+    c = a + b;
+  }
+
+  testParam(x, y) {
+    x = x * x;
+    y = y * y;
+    c = x + y;
+  }
+
+}
+
+testF() {
+  var f = new F();
+  for (var i = 0; i < 20; i++) {
+    f.test();
+  }
+  // Trigger a deopt of test.
+  f.testParam(1.0, 2.0);
+  for (var i = 0; i < 20; i++) {
+    f.test();

[Florian Schneider, 2014/02/06 12:38:49]

Maybe return a value to check from test(), or check that f.c contains the
correct value afterwards.

[Cutch, 2014/02/06 23:15:38]

Done.

+  }
+}
+
+
+main() {
+  testD();
+  testF();
+}