Copy-autorelease block IMPs
Copy-autorelease block IMPs

In some circumstances imp_implementationWithBlock deadlocks without
doing this.

demonnico/BlocksKit,aipeople/BlocksKit,Gitub/BlocksKit,owers19856/BlocksKit,dachaoisme/BlocksKit,zwaldowski/BlocksKit,HarrisLee/BlocksKit,zxq3220122/BlocksKit-1,yaoxiaoyong/BlocksKit,z8927623/BlocksKit,tattocau/BlocksKit,pomu0325/BlocksKit,ManagerOrganization/BlocksKit,stevenxiaoyang/BlocksKit,hartbit/BlocksKit,Voxer/BlocksKit,AlexanderMazaletskiy/BlocksKit,xinlehou/BlocksKit,coneman/BlocksKit,zhaoguohui/BlocksKit,shenhzou654321/BlocksKit,TomBin647/BlocksKit,anton-matosov/BlocksKit,yimouleng/BlocksKit,Herbert77/BlocksKit,pilot34/BlocksKit,hq804116393/BlocksKit