Major update of Rhino RegExp implementation.
Major update of Rhino RegExp implementation.

The major part of this consists of a backport of the improvements made to
Spidermonkey's jsregexp.c code over the years (before being replaced by
YARR in 2010), with some additional optimizations strewn in.

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