Rename CallBlock -> PointBlock
Rename CallBlock -> PointBlock

The old name is a vestige of when this code used to specifically deal with
calls, instead of generally dealing with point blocks.

kyulee1/llilcjit,tempbottle/llilc,swaroop-sridhar/llilc,russellhadley/llilc,JosephTremoulet/llilc,JosephTremoulet/llilc,pgavlin/llilc,JosephTremoulet/llilc,manu-silicon/llilc,pgavlin/llilc,libengu/llilc,dkorolev/llilc,libengu/llilc,richardlford/llilc,kyulee1/llilcjit,mmitche/llilc,manu-silicon/llilc,marksantos/llilc,AndyAyersMS/llilc,russellhadley/llilc,BruceForstall/llilc,adiaaida/llilc,adiaaida/llilc,adiaaida/llilc,dotnet/llilc,tempbottle/llilc,BruceForstall/llilc,manu-silicon/llilc,dkorolev/llilc,swaroop-sridhar/llilc,richardlford/llilc,marksantos/llilc,swaroop-sridhar/llilc,pgavlin/llilc,tempbottle/llilc,dotnet/llilc,kyulee1/llilcjit,mmitche/llilc,mmitche/llilc,AndyAyersMS/llilc,marksantos/llilc,russellhadley/llilc,dkorolev/llilc,richardlford/llilc,libengu/llilc,libengu/llilc,mmitche/llilc,dotnet/llilc,BruceForstall/llilc,AndyAyersMS/llilc