[mjsunit] Remove unsupported flag --turbo-deoptimization from tests.

test/mjsunit/regress/poly_count_operation.js

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-// Flags: --allow-natives-syntax --turbo-deoptimization
+// Flags: --allow-natives-syntax
 
 var o1 = {x:1};
 var o2 = {};
 var deopt_getter = false;
 var deopt_setter = false;
 
 function f_mono(o) {
   return 5 + o.x++;
 }
 
@@ skipping 107 matching lines @@
 deopt_getter = true;
 assertEquals(8, f_get(o2));
 assertEquals(14, g);
 assertEquals(14, s);
 
 %OptimizeFunctionOnNextCall(f_get);
 v = undefined;
 assertEquals(NaN, f_get(o2));
 assertEquals(15, g);
 assertEquals(15, s);