[AST] Allow to acquire a pointer to statement condition
[AST] Allow to acquire a pointer to statement condition

This is more of a (temporary) hack because condition could be reset
but that never happens during constraint solving, so it's relatively safe.

roambotics/swift,rudkx/swift,xwu/swift,glessard/swift,glessard/swift,rudkx/swift,roambotics/swift,roambotics/swift,gregomni/swift,gregomni/swift,xwu/swift,atrick/swift,atrick/swift,apple/swift,gregomni/swift,xwu/swift,gregomni/swift,JGiola/swift,apple/swift,ahoppen/swift,ahoppen/swift,glessard/swift,xwu/swift,roambotics/swift,rudkx/swift,rudkx/swift,ahoppen/swift,gregomni/swift,rudkx/swift,JGiola/swift,apple/swift,roambotics/swift,benlangmuir/swift,glessard/swift,benlangmuir/swift,apple/swift,xwu/swift,JGiola/swift,rudkx/swift,JGiola/swift,glessard/swift,xwu/swift,benlangmuir/swift,JGiola/swift,atrick/swift,apple/swift,xwu/swift,benlangmuir/swift,ahoppen/swift,gregomni/swift,atrick/swift,roambotics/swift,ahoppen/swift,benlangmuir/swift,atrick/swift,glessard/swift,JGiola/swift,ahoppen/swift,atrick/swift,benlangmuir/swift,apple/swift