Driver: Add Option flags.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66774 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Option.cpp b/lib/Driver/Option.cpp
index 7a53009..083eb8e 100644
--- a/lib/Driver/Option.cpp
+++ b/lib/Driver/Option.cpp
@@ -190,6 +190,7 @@
                                const OptionGroup *Group, const Option *Alias, 
                                unsigned _NumArgs)
   : Option(Option::MultiArgClass, ID, Name, Group, Alias), NumArgs(_NumArgs) {
+  assert(NumArgs > 1  && "Invalid MultiArgOption!");
 }
 
 Arg *MultiArgOption::accept(const ArgList &Args, unsigned &Index) const {