Driver: More Option implementation.
 - Add Options.def file, collects option information.

 - Actual option instantiation is handled lazily by OptTable to allow
   the driver to not need to instantiate all options.

 - cast<> support for Option, other minor tweaks.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@66028 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/driver/driver.cpp b/tools/driver/driver.cpp
index 919a870..ac739bf 100644
--- a/tools/driver/driver.cpp
+++ b/tools/driver/driver.cpp
@@ -14,6 +14,9 @@
 
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
+#include "clang/Driver/Option.h"
+#include "clang/Driver/Options.h"
+
 #include "llvm/ADT/OwningPtr.h"
 #include "llvm/System/Signals.h"
 using namespace clang;