ObjectiveC migration. Add support for inferring
properties of block pointer types. Also, remove
strong lifetime attribute from property type
in this migration. This is wip.
// rdar://15082818


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192226 91177308-0d34-0410-b5e6-96231b3b80d8