Fix clang/Driver/Options.h not found after llvm commit f63d33da0a51 (#584)

Author: wenju-he

options.cpp

@@ -18,9 +18,6 @@ Copyright (c) Intel Corporation (2009-2017).
 
 #include "options.h"
 
-#include "llvm/Option/Arg.h"
-#include "clang/Driver/Options.h"
-
 #include <iterator>
 #include <sstream>
 

options_compile.cpp

@@ -19,11 +19,8 @@ Copyright (c) Intel Corporation (2009-2017).
 #include "opencl_clang.h"
 #include "options.h"
 
-#include "clang/Driver/Options.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/Option/Arg.h"
-#include "llvm/Option/ArgList.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Mutex.h"