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

test/mjsunit/array-bounds-check-removal.js

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-// Flags: --allow-natives-syntax --expose-gc
+// Flags: --allow-natives-syntax --expose-gc --no-always-opt
 
 var a = new Int32Array(1024);
 
 // Test that we do not assert if the accessed index has not an int32 rep.
 var v = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
 function test_do_not_assert_on_non_int32(vector, base) {
   var r = 0;
   var a1 = base + 1;
   var a2 = base + 2;
   var a3 = base + 3;
@@ skipping 183 matching lines @@
 result_composition = test_composition(data_composition_long, 2);
 assertEquals(19, result_composition);
 result_composition = test_composition(data_composition_long, 2);
 assertEquals(19, result_composition);
 %OptimizeFunctionOnNextCall(test_composition);
 result_composition = test_composition(data_composition_short, 2);
 assertEquals(NaN, result_composition);
 
 
 gc();