hopefully fix VC++ build error.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@67741 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 85d76c8..dc303ad 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -33,6 +33,7 @@
 #include <map>
 
 using namespace clang::driver;
+using namespace clang;
 
 Driver::Driver(const char *_Name, const char *_Dir,
                const char *_DefaultHostTriple,