Support Float64Arrays

test/mjsunit/external-array.js

Index: test/mjsunit/external-array.js
diff --git a/test/mjsunit/external-array.js b/test/mjsunit/external-array.js
index 45d8be5a99f0f36b1196d2d0a381e81cbad08ed3..71f9b84e90153af923c57404e7c1ac777494e925 100644
--- a/test/mjsunit/external-array.js
+++ b/test/mjsunit/external-array.js
@@ -63,3 +63,28 @@ assertEquals(1, a.BYTES_PER_ELEMENT);
 a = new Int16Array(2);
 assertEquals(2, a.BYTES_PER_ELEMENT);
 
+// Test Float64Arrays.
+function get(a, index) {
+  return a[index];
+}
+function set(a, index, value) {
+  a[index] = value;
+}
+
+var array = new Float64Array(2);
+for (var i = 0; i < 5; i++) {
+  set(array, 0, 2.5);
+  assertEquals(2.5, array[0]);
+}
+%OptimizeFunctionOnNextCall(set);
+set(array, 0, 2.5);
+assertEquals(2.5, array[0]);
+set(array, 1, 3.5);
+assertEquals(3.5, array[1]);
+for (var i = 0; i < 5; i++) {
+  assertEquals(2.5, get(array, 0));
+  assertEquals(3.5, array[1]);
+}
+%OptimizeFunctionOnNextCall(get);
+assertEquals(2.5, get(array, 0));
+assertEquals(3.5, get(array, 1));