Fix a typo introduced in r168577: FlAGS -> FLAGS (note the lowercase ell)

Now we really pass -Wcovered-switch-default if the compiler supports it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171040 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed