COFF section flags are not idempotent:
'rd' will make a read-write section because 'd' implies write
'dr' will make a read-only section because 'r' disables write
llvm-svn: 228490
This is dependent on changes that are not fully ready to be merged yet (WoA
object file emission). The test can be re-enabled for that target later.
llvm-svn: 207038