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

test/mjsunit/compiler/osr-sar.js

 // Copyright 2012 the V8 project authors. All rights reserved.
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-// Flags: --allow-natives-syntax --use-osr --turbo-osr
+// Flags: --allow-natives-syntax --use-osr
 
 function test() {
   // Loop to force OSR.
   var j = 0;
   for (var i = 0; i < 80000; i++) {
     j++;
   }
 
   function SarShr(val) {
     return val >> (-2 >>> 0);
   }
 
   var K3 = 0x80000000;
   assertEquals(-2, SarShr(K3 | 0));
   assertEquals(-2, SarShr(K3 | 0));
   %OptimizeFunctionOnNextCall(SarShr);
   assertEquals(-2, SarShr(K3 | 0));
 }
 
 test();
 //test();