Update checker build to checker-271.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174252 91177308-0d34-0410-b5e6-96231b3b80d8
On platforms which do not support ARC natively, do not mark objc_retain/objc_release as "nonlazybind".

rdar://13108298.
rdar://13129783.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@174253 91177308-0d34-0410-b5e6-96231b3b80d8