[turbofan] Implement OSR for outer loops.

test/mjsunit/compiler/osr-manual2.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.
+
+// Flags: --allow-natives-syntax --use-osr --turbo-osr
+
+var counter = 188;
+
+function gen() {  // defeat compiler cache.
+ var num = counter++;
+ var src =
+  "function f" + num + "(Z,a,b,c) {" +
+  "  var x = 0;" +
+  "  var y = 0;" +
+  "  var z = 0;" +
+  "  while (a > 0) { Z(0); x += 19; a--; var j=2; while(j--); }" +
+  "  while (b > 0) { Z(1); y += 23; b--; var j=2; while(j--); }" +
+  "  while (c > 0) { Z(2); z += 29; c--; var j=2; while(j--); }" +
+  "  return x + y + z;" +
+  "} f" + num;
+
+  return eval(src);
+}
+
+function compiler(a) {  // manual control of OSR compiles.
+  var x = 0;
+  function count(l) {
+    if (l == a && (x++) > 0) {
+      %OptimizeFunctionOnNextCall(count.caller, "osr");
+    }
+  }
+  return count;
+}
+
+function check(x,a,b,c) {
+  function none(l) { }
+
+  for (var i = 0; i < 3; i++) {
+    var f = gen();
+    assertEquals(x, f(compiler(i), a, b, c));
+    assertEquals(x, f(none, a, b, c));
+  }
+}
+
+check(213, 3,3,3);
+check(365, 4,5,6);
+check(6948, 99,98,97);