ObjectiveC. ObjectiveC's collection selector expression in
the fereach loop must be a non-const lvalue expression as
it will be assigned to at the beginning of the loop.
// rdar://15123684


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192399 91177308-0d34-0410-b5e6-96231b3b80d8