Debugger: deduplicate shared function info when setting script break points.

test/mjsunit/debug-liveedit-4.js

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-// Flags: --expose-debug-as debug
+// Flags: --expose-debug-as debug --noalways-opt
 // Get the Debug object exposed from the debug context global object.
 
 // In this test case we edit a script so that techincally function text
 // hasen't been changed. However actually function became one level more nested
 // and must be recompiled because it uses variable from outer scope.
 
 
 Debug = debug.Debug
 
 eval(
@@ skipping 21 matching lines @@
 var change_log = new Array();
 var result = Debug.LiveEdit.SetScriptSource(script, new_source, false, change_log);
 
 print("Result: " + JSON.stringify(result) + "\n");
 print("Change log: " + JSON.stringify(change_log) + "\n");
 
 var res = TestFunction();
 print(res);
 // This might be 'a,b' without a bug fixed.
 assertEquals('a,c', res);