[mjsunit] Remove unsupported flag --turbo-deoptimization from tests.

test/mjsunit/debug-references.js

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-// Flags: --expose-debug-as debug --turbo-deoptimization
-// Flags: --stack-trace-on-illegal
+// Flags: --expose-debug-as debug --stack-trace-on-illegal
 
 // Get the Debug object exposed from the debug context global object.
 Debug = debug.Debug
 
 listenerComplete = false;
 exception = false;
 
 // The base part of all evaluate requests.
 var base_request = '"seq":0,"type":"request","command":"references"'
 
@@ skipping 72 matching lines @@
 function Point(x, y) { this.x_ = x; this.y_ = y;}
 p = new Point(0,0);
 q = new Point(1,2);
 
 // Enter debugger causing the event listener to be called.
 debugger;
 
 // Make sure that the debug event listener was invoked.
 assertFalse(exception, "exception in listener")
 assertTrue(listenerComplete, "listener did not run to completion");