[turbofan] Fix missing machine type for float32/float64 array accesses.

test/mjsunit/asm/float32array-store-div.js

Index: test/mjsunit/asm/float32array-store-div.js
diff --git a/test/mjsunit/asm/float32array-store-div.js b/test/mjsunit/asm/float32array-store-div.js
new file mode 100644
index 0000000000000000000000000000000000000000..78224f962b7971f2b86a5381e98e2bbd2c63ca13
--- /dev/null
+++ b/test/mjsunit/asm/float32array-store-div.js
@@ -0,0 +1,16 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function Module(stdlib, foreign, heap) {
+  "use asm";
+  var MEM32 = new stdlib.Float32Array(heap);
+  function foo(i) {
+    MEM32[0] = (i >>> 0) / 2;
+    return MEM32[0];
+  }
+  return { foo: foo };
+}
+
+var foo = Module(this, {}, new ArrayBuffer(64 * 1024)).foo;
+assertEquals(0.5, foo(1));