Implement isStructRequiringStackAllocRetBuf
Implement isStructRequiringStackAllocRetBuf

This is the last piece needed to let us run the colorful Hello World
demo.

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