Fix filter funclet handling during stack walk on Unix (#5183)
Fix filter funclet handling during stack walk on Unix (#5183)

The filter funclets are not handled correctly during stack walk on Unix. When
the funclet's parent frame is reached, the filter funclet was mistakenly handled
as a non-filter funclet by the Unix specific code that is used to figure out
parent frames of funclets from exception trackers.
The fix is to skip this Unix specific code when we are looking for a parent of
a filter funclet. Filter funclet frame is always on the stack when the stack
walk reaches its parent frame.
AlexGhiondea/coreclr,botaberg/coreclr,russellhadley/coreclr,sagood/coreclr,botaberg/coreclr,Dmitry-Me/coreclr,parjong/coreclr,yizhang82/coreclr,hseok-oh/coreclr,LLITCHEV/coreclr,mmitche/coreclr,Dmitry-Me/coreclr,krytarowski/coreclr,botaberg/coreclr,gkhanna79/coreclr,martinwoodward/coreclr,schellap/coreclr,hseok-oh/coreclr,tijoytom/coreclr,alexperovich/coreclr,dpodder/coreclr,martinwoodward/coreclr,KrzysztofCwalina/coreclr,yizhang82/coreclr,kyulee1/coreclr,cmckinsey/coreclr,mmitche/coreclr,cshung/coreclr,josteink/coreclr,gkhanna79/coreclr,shahid-pk/coreclr,Dmitry-Me/coreclr,dpodder/coreclr,yeaicc/coreclr,cmckinsey/coreclr,josteink/coreclr,jamesqo/coreclr,LLITCHEV/coreclr,shahid-pk/coreclr,wateret/coreclr,ramarag/coreclr,tijoytom/coreclr,vinnyrom/coreclr,wateret/coreclr,jhendrixMSFT/coreclr,ZhichengZhu/coreclr,botaberg/coreclr,dasMulli/coreclr,kyulee1/coreclr,parjong/coreclr,hseok-oh/coreclr,naamunds/coreclr,dasMulli/coreclr,YongseopKim/coreclr,dpodder/coreclr,cshung/coreclr,vinnyrom/coreclr,JosephTremoulet/coreclr,roncain/coreclr,sagood/coreclr,poizan42/coreclr,vinnyrom/coreclr,ragmani/coreclr,rartemev/coreclr,poizan42/coreclr,jhendrixMSFT/coreclr,naamunds/coreclr,pgavlin/coreclr,rartemev/coreclr,JonHanna/coreclr,naamunds/coreclr,gkhanna79/coreclr,parjong/coreclr,cydhaselton/coreclr,schellap/coreclr,sagood/coreclr,ruben-ayrapetyan/coreclr,ragmani/coreclr,wtgodbe/coreclr,ZhichengZhu/coreclr,poizan42/coreclr,JosephTremoulet/coreclr,JosephTremoulet/coreclr,neurospeech/coreclr,roncain/coreclr,ZhichengZhu/coreclr,cmckinsey/coreclr,bartdesmet/coreclr,josteink/coreclr,cydhaselton/coreclr,manu-silicon/coreclr,russellhadley/coreclr,mskvortsov/coreclr,schellap/coreclr,shahid-pk/coreclr,KrzysztofCwalina/coreclr,mmitche/coreclr,bartdesmet/coreclr,shahid-pk/coreclr,LLITCHEV/coreclr,yeaicc/coreclr,martinwoodward/coreclr,cshung/coreclr,tijoytom/coreclr,JonHanna/coreclr,AlexGhiondea/coreclr,wateret/coreclr,parjong/coreclr,cmckinsey/coreclr,cmckinsey/coreclr,ruben-ayrapetyan/coreclr,cydhaselton/coreclr,tijoytom/coreclr,ZhichengZhu/coreclr,jamesqo/coreclr,sjsinju/coreclr,kyulee1/coreclr,Dmitry-Me/coreclr,ZhichengZhu/coreclr,yeaicc/coreclr,YongseopKim/coreclr,ragmani/coreclr,mmitche/coreclr,parjong/coreclr,qiudesong/coreclr,roncain/coreclr,manu-silicon/coreclr,JonHanna/coreclr,AlexGhiondea/coreclr,ruben-ayrapetyan/coreclr,tijoytom/coreclr,dasMulli/coreclr,shahid-pk/coreclr,cmckinsey/coreclr,rartemev/coreclr,poizan42/coreclr,neurospeech/coreclr,krytarowski/coreclr,qiudesong/coreclr,cydhaselton/coreclr,yeaicc/coreclr,naamunds/coreclr,ramarag/coreclr,bartdesmet/coreclr,yizhang82/coreclr,cmckinsey/coreclr,alexperovich/coreclr,vinnyrom/coreclr,manu-silicon/coreclr,dpodder/coreclr,AlexGhiondea/coreclr,yeaicc/coreclr,dasMulli/coreclr,ragmani/coreclr,jamesqo/coreclr,ragmani/coreclr,yizhang82/coreclr,gkhanna79/coreclr,jhendrixMSFT/coreclr,hseok-oh/coreclr,alexperovich/coreclr,vinnyrom/coreclr,Dmitry-Me/coreclr,manu-silicon/coreclr,JosephTremoulet/coreclr,schellap/coreclr,naamunds/coreclr,sagood/coreclr,manu-silicon/coreclr,pgavlin/coreclr,poizan42/coreclr,krytarowski/coreclr,wateret/coreclr,wateret/coreclr,YongseopKim/coreclr,krk/coreclr,bartdesmet/coreclr,cshung/coreclr,sagood/coreclr,ruben-ayrapetyan/coreclr,jamesqo/coreclr,hseok-oh/coreclr,sagood/coreclr,pgavlin/coreclr,krk/coreclr,krytarowski/coreclr,James-Ko/coreclr,KrzysztofCwalina/coreclr,ramarag/coreclr,krk/coreclr,KrzysztofCwalina/coreclr,roncain/coreclr,JonHanna/coreclr,YongseopKim/coreclr,josteink/coreclr,parjong/coreclr,jhendrixMSFT/coreclr,qiudesong/coreclr,ramarag/coreclr,schellap/coreclr,wtgodbe/coreclr,dpodder/coreclr,dasMulli/coreclr,AlexGhiondea/coreclr,JonHanna/coreclr,rartemev/coreclr,sjsinju/coreclr,neurospeech/coreclr,botaberg/coreclr,mskvortsov/coreclr,schellap/coreclr,yeaicc/coreclr,KrzysztofCwalina/coreclr,hseok-oh/coreclr,yeaicc/coreclr,rartemev/coreclr,pgavlin/coreclr,dasMulli/coreclr,bartdesmet/coreclr,jhendrixMSFT/coreclr,James-Ko/coreclr,krytarowski/coreclr,krytarowski/coreclr,josteink/coreclr,LLITCHEV/coreclr,bartdesmet/coreclr,martinwoodward/coreclr,kyulee1/coreclr,JonHanna/coreclr,tijoytom/coreclr,alexperovich/coreclr,YongseopKim/coreclr,russellhadley/coreclr,mskvortsov/coreclr,ramarag/coreclr,krk/coreclr,josteink/coreclr,AlexGhiondea/coreclr,ruben-ayrapetyan/coreclr,sjsinju/coreclr,jamesqo/coreclr,gkhanna79/coreclr,shahid-pk/coreclr,schellap/coreclr,YongseopKim/coreclr,krk/coreclr,mskvortsov/coreclr,LLITCHEV/coreclr,rartemev/coreclr,James-Ko/coreclr,KrzysztofCwalina/coreclr,wtgodbe/coreclr,vinnyrom/coreclr,roncain/coreclr,dasMulli/coreclr,ZhichengZhu/coreclr,krk/coreclr,mmitche/coreclr,manu-silicon/coreclr,bartdesmet/coreclr,shahid-pk/coreclr,josteink/coreclr,jhendrixMSFT/coreclr,neurospeech/coreclr,James-Ko/coreclr,wtgodbe/coreclr,qiudesong/coreclr,mmitche/coreclr,James-Ko/coreclr,sjsinju/coreclr,ragmani/coreclr,yizhang82/coreclr,vinnyrom/coreclr,wateret/coreclr,manu-silicon/coreclr,gkhanna79/coreclr,neurospeech/coreclr,James-Ko/coreclr,russellhadley/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