Debugger: stepping out into JsBuiltIn functions

[sigatrev]

Stepping out from callbacks called by JsBuiltIn functions results in some frame information from the built in being visible.

Repro: change the every call to forEach in DebuggerCommon/returnvaluetest1.js

[jackhorton]

This may also be causing flakiness in chakrafull\unittest\Debugger\intlib.js. Just disabled it but you may want to investigate.

[kfarnung]

@yullin-ms Can you look into this as part of your JS built-ins work?

[yullin-ms]

I'm taking a look at it