Backport #4078 and #4125 to 4.x: walk the prototype chain, and probe a wrapper's forward - #4170

Backport #4078 and #4125 to 4.x: walk the prototype chain, and probe a wrapper's forward#4170

lahma merged 2 commits into

sebastienros:4.xsebastienros/jint:4.xfrom

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