Expose the a2_hasImplementationWithBlock function for use in BlocksKit.
Expose the a2_hasImplementationWithBlock function for use in BlocksKit.

Signed-off-by: Zachary Waldowski <f6cb034ae1bf314d2c0261a7a22e4684d1f74b57@gmail.com>

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