Add -fno-function-sections and -fno-data-sections. Since
-f{function,data}-sections had no tests at all, add some, and verify that the
-fno variants work as well.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192413 91177308-0d34-0410-b5e6-96231b3b80d8