Add nonlazybind to objc_retain/objc_release when converting from intrinsics.

For performance reasons, clang set nonlazybind on these functions.  Now that we
are using intrinsics instead of runtime calls, we should set this attribute when
creating the runtime functions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349558 91177308-0d34-0410-b5e6-96231b3b80d8