[turbofan] Initial version of branch cloning.

test/mjsunit/asm/if-cloning.js

+// Copyright 2015 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.
+
+var if0 = (function Module() {
+  "use asm";
+  function if0(i, j) {
+    i = i|0;
+    j = j|0;
+    if (i == 0 ? j == 0 : 0) return 1;
+    return 0;
+  }
+  return {if0: if0};
+})().if0;
+assertEquals(1, if0(0, 0));
+assertEquals(0, if0(11, 0));
+assertEquals(0, if0(0, -1));
+assertEquals(0, if0(-1024, 1));
+
+
+var if1 = (function Module() {
+  "use asm";
+  function if1(i, j) {
+    i = i|0;
+    j = j|0;
+    if (i == 0 ? j == 0 : 1) return 0;
+    return 1;
+  }
+  return {if1: if1};
+})().if1;
+assertEquals(0, if1(0, 0));
+assertEquals(0, if1(11, 0));
+assertEquals(1, if1(0, -1));
+assertEquals(0, if1(-1024, 9));