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

test/mjsunit/sin-cos.js

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 // Test Math.sin and Math.cos.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --crankshaft
 
 assertEquals("-Infinity", String(1/Math.sin(-0)));
 assertEquals(1, Math.cos(-0));
 assertEquals("-Infinity", String(1/Math.tan(-0)));
 
 // Assert that minus zero does not cause deopt.
 function no_deopt_on_minus_zero(x) {
   return Math.sin(x) + Math.cos(x) + Math.tan(x);
 }
 
@@ skipping 232 matching lines @@
 assertEquals(-6.420676210313675e-11, Math.tan(1048576/2*Math.PI));
 assertEquals(2.910566692924059e11, Math.tan(1048575/2*Math.PI));
 
 // Test Hayne-Panek reduction.
 assertEquals(0.377820109360752e0, Math.sin(Math.pow(2, 120)));
 assertEquals(-0.9258790228548379e0, Math.cos(Math.pow(2, 120)));
 assertEquals(-0.40806638884180424e0, Math.tan(Math.pow(2, 120)));
 assertEquals(-0.377820109360752e0, Math.sin(-Math.pow(2, 120)));
 assertEquals(-0.9258790228548379e0, Math.cos(-Math.pow(2, 120)));
 assertEquals(0.40806638884180424e0, Math.tan(-Math.pow(2, 120)));