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

[Reid Kleckner]

The big changes are:
- Deleting Driver/(Arg|Opt)*
- Rewriting includes to llvm/Option/ and re-sorting
- 'using namespace llvm::opt;' in Driver and Frontend .cpp files
- Adding 'llvm::opt::' specifiers to .h files
- git-clang-format on the changes, which mostly affects the .h files due
  to the extra specifiers

I could reduce the diff significantly with using directives in the
internal Driver and Frontend header files if people feel like that's OK.
See for example ToolChains.h.  The coding standards talk about using
directives being OK in "implementation" files, and internal headers may
fall into that category.

clang-format produced some formattings that I'm not sure are standard
LLVM style.  They look like:
  ReturnTypeIsReallyLong
      methodNameIsAlsoUnusuallyLong(ParamTy P1, ParamTy P2);

I think I see this more commonly:
  ReturnTypeIsReallyLong
  methodNameIsAlsoUnusuallyLong(ParamTy P1, ParamTy P2);
Or:
  ReturnTypeIsReallyLong methodNameIsAlsoUnusuallyLong(ParamTy P1,
                                                       ParamTy P2);

I figured I should ask up front if that's OK, and if not, it's probably
best to go fix clang-format, re-run, and resend.

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

Files:
  include/clang/Driver/Action.h
  include/clang/Driver/Arg.h
  include/clang/Driver/ArgList.h
  include/clang/Driver/CC1AsOptions.h
  include/clang/Driver/CC1AsOptions.td
  include/clang/Driver/CMakeLists.txt
  include/clang/Driver/Compilation.h
  include/clang/Driver/Driver.h
  include/clang/Driver/Job.h
  include/clang/Driver/OptParser.td
  include/clang/Driver/OptSpecifier.h
  include/clang/Driver/OptTable.h
  include/clang/Driver/Option.h
  include/clang/Driver/Options.h
  include/clang/Driver/Options.td
  include/clang/Driver/Tool.h
  include/clang/Driver/ToolChain.h
  include/clang/Driver/Util.h
  include/clang/Frontend/CompilerInvocation.h
  include/clang/Frontend/Utils.h
  lib/Driver/Action.cpp
  lib/Driver/Arg.cpp
  lib/Driver/ArgList.cpp
  lib/Driver/CC1AsOptions.cpp
  lib/Driver/CMakeLists.txt
  lib/Driver/Compilation.cpp
  lib/Driver/Driver.cpp
  lib/Driver/DriverOptions.cpp
  lib/Driver/InputInfo.h
  lib/Driver/Job.cpp
  lib/Driver/OptTable.cpp
  lib/Driver/Option.cpp
  lib/Driver/SanitizerArgs.h
  lib/Driver/ToolChain.cpp
  lib/Driver/ToolChains.cpp
  lib/Driver/ToolChains.h
  lib/Driver/Tools.cpp
  lib/Driver/Tools.h
  lib/Driver/WindowsToolChain.cpp
  lib/Frontend/CompilerInvocation.cpp
  lib/Frontend/CreateInvocationFromCommandLine.cpp
  lib/FrontendTool/ExecuteCompilerInvocation.cpp
  lib/Tooling/Tooling.cpp
  tools/clang-check/ClangCheck.cpp
  tools/driver/cc1_main.cpp
  tools/driver/cc1as_main.cpp
  tools/driver/driver.cpp
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