[turbofan] Properly emit bounds checks for typed array element loads.

test/mjsunit/asm/float32array-outofbounds.js

+// 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 load(i) {
+    i = i|0;
+    i = +MEM32[i >> 2];
+    return i;
+  }
+  function store(i, v) {
+    i = i|0;
+    v = +v;
+    MEM32[i >> 2] = v;
+  }
+  return { load: load, store: store };
+}
+
+var m = Module(this, {}, new ArrayBuffer(4));
+
+m.store(0, 42.0);
+for (var i = 1; i < 64; ++i) {
+  m.store(i * 4 * 32 * 1024, i);
+}
+assertEquals(42.0, m.load(0));
+for (var i = 1; i < 64; ++i) {
+  assertEquals(NaN, m.load(i * 4 * 32 * 1024));
+}