Objective-C. Remove an assertion which asserts
on correctly handled block layout IRGen. 
// rdar://16111839


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202063 91177308-0d34-0410-b5e6-96231b3b80d8
Add a test for r202059.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@202064 91177308-0d34-0410-b5e6-96231b3b80d8