Reverting r182337, which merged r182266, __declspec(selectany)

Was "Implement __declspec(selectany) under -fms-extensions ..."


git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_33@182381 91177308-0d34-0410-b5e6-96231b3b80d8