[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/tools/c-index-test/Makefile b/clang/tools/c-index-test/Makefile
index 7723115..4df90e6 100644
--- a/clang/tools/c-index-test/Makefile
+++ b/clang/tools/c-index-test/Makefile
@@ -22,7 +22,7 @@
 # LINK_COMPONENTS before including Makefile.rules
 include $(CLANG_LEVEL)/../../Makefile.config
 
-LINK_COMPONENTS := $(TARGETS_TO_BUILD) asmparser bitreader support mc
+LINK_COMPONENTS := $(TARGETS_TO_BUILD) asmparser bitreader support mc option
 
 # Note that 'USEDLIBS' must include all of the core clang libraries
 # when -static is given to linker on cygming.