Extend optimization ==, !=, ===, !== against null to check null presence on any side of the test.
Extend optimization ==, !=, ===, !== against null to check null presence on any side of the test.

Pilarbrist/rhino,InstantWebP2P/rhino-android,Pilarbrist/rhino,sainaen/rhino,qhanam/rhino,sam/htmlunit-rhino-fork,AlexTrotsenko/rhino,ashwinrayaprolu1984/rhino,Angelfirenze/rhino,tntim96/rhino-jscover-repackaged,Angelfirenze/rhino,swannodette/rhino,tejassaoji/RhinoCoarseTainting,AlexTrotsenko/rhino,lv7777/egit_test,swannodette/rhino,ashwinrayaprolu1984/rhino,tuchida/rhino,lv7777/egit_test,ashwinrayaprolu1984/rhino,swannodette/rhino,qhanam/rhino,ashwinrayaprolu1984/rhino,tntim96/rhino-jscover-repackaged,jsdoc3/rhino,rasmuserik/rhino,ashwinrayaprolu1984/rhino,Angelfirenze/rhino,lv7777/egit_test,sainaen/rhino,tejassaoji/RhinoCoarseTainting,tntim96/rhino-apigee,tntim96/rhino-jscover,Angelfirenze/rhino,tntim96/rhino-apigee,lv7777/egit_test,Angelfirenze/rhino,sainaen/rhino,swannodette/rhino,tejassaoji/RhinoCoarseTainting,AlexTrotsenko/rhino,InstantWebP2P/rhino-android,lv7777/egit_test,AlexTrotsenko/rhino,AlexTrotsenko/rhino,Pilarbrist/rhino,tuchida/rhino,swannodette/rhino,sam/htmlunit-rhino-fork,Distrotech/rhino,sam/htmlunit-rhino-fork,tntim96/rhino-apigee,Pilarbrist/rhino,jsdoc3/rhino,tuchida/rhino,sainaen/rhino,sam/htmlunit-rhino-fork,tuchida/rhino,sainaen/rhino,ashwinrayaprolu1984/rhino,tuchida/rhino,tejassaoji/RhinoCoarseTainting,qhanam/rhino,Pilarbrist/rhino,tuchida/rhino,sam/htmlunit-rhino-fork,sam/htmlunit-rhino-fork,lv7777/egit_test,tejassaoji/RhinoCoarseTainting,AlexTrotsenko/rhino,tntim96/rhino-jscover,tejassaoji/RhinoCoarseTainting,qhanam/rhino,Distrotech/rhino,sainaen/rhino,Angelfirenze/rhino,AlexTrotsenko/rhino,ashwinrayaprolu1984/rhino,Pilarbrist/rhino,tuchida/rhino,swannodette/rhino,tntim96/htmlunit-rhino-fork,tntim96/htmlunit-rhino-fork,tejassaoji/RhinoCoarseTainting,Pilarbrist/rhino,sam/htmlunit-rhino-fork,rasmuserik/rhino,jsdoc3/rhino,lv7777/egit_test,swannodette/rhino,Angelfirenze/rhino,sainaen/rhino