Remove rest of PInvoke stub workarounds
Remove rest of PInvoke stub workarounds

We now implement this.

botaberg/corert,yizhang82/corert,tijoytom/corert,krytarowski/corert,shrah/corert,krytarowski/corert,schellap/corert,botaberg/corert,manu-silicon/corert,gregkalapos/corert,yizhang82/corert,tijoytom/corert,mjp41/corert,schellap/corert,mjp41/corert,mjp41/corert,mjp41/corert,shrah/corert,krytarowski/corert,kyulee1/corert,schellap/corert,sandreenko/corert,shrah/corert,yizhang82/corert,botaberg/corert,kyulee1/corert,manu-silicon/corert,botaberg/corert,shrah/corert,yizhang82/corert,manu-silicon/corert,schellap/corert,gregkalapos/corert,manu-silicon/corert,manu-silicon/corert,krytarowski/corert,gregkalapos/corert,tijoytom/corert,schellap/corert,sandreenko/corert,kyulee1/corert,tijoytom/corert,kyulee1/corert,gregkalapos/corert,sandreenko/corert,sandreenko/corert,mjp41/corert