Make it easier to test OSR with %OptimizeOsr() runtime call.

test/mjsunit/compiler/osr-regex-id.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.
 
 // Flags: --allow-natives-syntax --use-osr --turbo-osr
 
 function id(f) { return f; }
 
 function foo(a) {
   var r = /\0/;
   for (var i = 0; i < 10; i++) {
-    if (a) %OptimizeFunctionOnNextCall(foo, "osr");
+    if (a) %OptimizeOsr();
   }
   return r;
 }
 
 function bar(a) {
   for (var i = 0; i < 10; i++) {
-    if (a) %OptimizeFunctionOnNextCall(bar, "osr");
+    if (a) %OptimizeOsr();
     var r = /\0/;
   }
   return r;
 }
 
 function baz(a) {
   for (var i = 0; i < 10; i++) {
-    if (a) %OptimizeFunctionOnNextCall(baz, "osr");
+    if (a) %OptimizeOsr();
   }
   return /\0/;
 }
 
 function qux(a) {
   for (var i = 0; i < 10; i++) {
     if (i > 5 && a) {
-      %OptimizeFunctionOnNextCall(qux, "osr");
+      %OptimizeOsr();
     } else {
       var r = /\0/;
     }
   }
   return r;
 }
 
 function test(f) {
   // Test the reference equality of regex's created in OSR'd function.
   var x = f(false);
   assertEquals(x, f(true));
   assertEquals(x, f(true));
   assertEquals(x, f(true));
 }
 
 test(foo);
 test(bar);
 test(baz);
 test(qux);