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

test/mjsunit/debug-liveedit-2.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.
 
 
 Debug = debug.Debug
 
 eval("function ChooseAnimal(p) {\n " +
      "  if (p == 7) {\n" + // Use p
      "    return;\n" +
      "  }\n" +
      "  return function Chooser() {\n" +
@@ skipping 18 matching lines @@
 var change_log = new Array();
 Debug.LiveEdit.TestApi.ApplySingleChunkPatch(script, patch_pos, orig_animal.length, new_animal_patch, change_log);
 print("Change log: " + JSON.stringify(change_log) + "\n");
 
 var new_closure = ChooseAnimal(19);
 // New instance of closure is patched.
 assertEquals("Capybara19", new_closure());
 
 // Old instance of closure is not patched.
 assertEquals("Cat", old_closure());