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

test/debugger/debug/es6/debug-blockscopes.js

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-// Flags: --noanalyze-environment-liveness
+// Flags: --noanalyze-environment-liveness --crankshaft
 // The functions used for testing backtraces. They are at the top to make the
 // testing of source line/column easier.
 
 "use strict";
 
 var Debug = debug.Debug;
 
 var test_name;
 var listener_delegate;
 var listener_called;
@@ skipping 439 matching lines @@
     debugger;
   }
 }
 
 listener_delegate = function (exec_state) {
   assertEqualsUnlessOptimized(0, exec_state.frame(0).evaluate("i").value());
   assertEqualsUnlessOptimized(5, exec_state.frame(0).evaluate("j").value());
 }
 shadowing_2();
 EndTest();