Deoptimize context value in Turbofan (and Crankshaft).

test/mjsunit/regress/regress-1170187.js

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 // Flags: --expose-debug-as debug
+// Flags: --turbo-deoptimization
+
 // Make sure that the retreival of local variables are performed correctly even
 // when an adapter frame is present.
 
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 listenerCalled = false;
 exception = false;
 
 
@@ skipping 32 matching lines @@
 // Add the debug event listener.
 Debug.setListener(listener);
 
 // Call a function with local variables passing a different number parameters
 // that the number of arguments.
 (function(x,y){var a,b,c; debugger; return 3})()
 
 // Make sure that the debug event listener vas invoked (again).
 assertTrue(listenerCalled);
 assertFalse(exception, "exception in listener")