[turbofan] Remove deprecated --turbo-osr flag.

test/mjsunit/compiler/osr-infinite.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: --use-osr --allow-natives-syntax --turbo-osr
+// Flags: --use-osr --allow-natives-syntax
 
 var global_counter = 0;
 
 function thrower() {
   var x = global_counter++;
   if (x == 5)  %OptimizeOsr(thrower.caller);
   if (x == 10) throw "terminate";
 }
 
 %NeverOptimizeFunction(thrower);  // Don't want to inline the thrower.
@@ skipping 53 matching lines @@
 }
 
 
 test(n1);
 test(n2);
 test(n3);
 test(n4);
 test(b1);
 test(b2);
 test(b3);