[tests] Cleanup tests that use assertOptimized()/assertUnoptimized().

test/mjsunit/regress/regress-param-local-type.js

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-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft
 
 // Test that we do not confuse the first local and the first parameter
 // when gathering type information.
 
 function f(a) {  // First parameter is tagged.
   var s = '';    // First local has string type.
   var n = 0;
   var i = 1;
   n = i + a;
 }
@@ skipping 10 matching lines @@
   var n = 0;
   var i = 1;
   n = i + this;
 }
 
 g.call(1);
 g.call(1);
 %OptimizeFunctionOnNextCall(g);
 g.call(1);
 assertOptimized(g);