_Z6memcpyPvPKvj is called, but not defined
This is probalby a bug in Coriander. Please file an issue at https://github.com/hughperkins/coriander/issues/new
basicblockdumper.runGeneration got exception whilst processing:
call void @_Z6memcpyPvPKvj(i8* nonnull %50, i8* nonnull %49, i32 4) #6