[Driver] Refactor clang driver to use LLVM's Option library

The big changes are:
- Deleting Driver/(Arg|Opt)*
- Rewriting includes to llvm/Option/ and re-sorting
- 'using namespace llvm::opt' in clang::driver
- Fixing the autoconf build by adding option everywhere

As discussed in the review, this change includes using directives in
header files.  I'll make follow up changes to remove those in favor of
name specifiers.

Reviewers: espindola

Differential Revision: http://llvm-reviews.chandlerc.com/D975

llvm-svn: 183989
diff --git a/clang/lib/Driver/Tools.h b/clang/lib/Driver/Tools.h
index d647171..8250527 100644
--- a/clang/lib/Driver/Tools.h
+++ b/clang/lib/Driver/Tools.h
@@ -14,6 +14,7 @@
 #include "clang/Driver/Types.h"
 #include "clang/Driver/Util.h"
 #include "llvm/ADT/Triple.h"
+#include "llvm/Option/Option.h"
 #include "llvm/Support/Compiler.h"
 
 namespace clang {
@@ -27,6 +28,7 @@
 }
 
 namespace tools {
+using llvm::opt::ArgStringList;
 
   /// \brief Clang compiler tool.
   class LLVM_LIBRARY_VISIBILITY Clang : public Tool {