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

test/mjsunit/getters-on-elements.js

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 // Flags: --allow-natives-syntax --max-opt-count=100 --noalways-opt
-// Flags: --nocollect-maps
+// Flags: --nocollect-maps --crankshaft
 
 // We specify max-opt-count because we opt/deopt the same function many
 // times.
 
 // We specify nocollect-maps because in gcstress we can end up deoptimizing
 // a function in a gc in the stack guard at the beginning of the (optimized)
 // function due to leftover map clearing work that results in deoptimizing
 // dependent code from those maps. The choice is to insert strategic gc()
 // calls or specify this flag.
 
@@ skipping 172 matching lines @@
 optimize(fun);
 fun(a);
 assertOptimized(fun);
 
 var calls = 0;
 delete a[0];
 ap.__defineGetter__(0, function() { calls++; return 0; });
 fun(a);
 assertEquals(1, calls);
 assertUnoptimized(fun);