[PATCH] [Driver] Remove the using namespace directives from headers

[Reid Kleckner]

This adds a bunch of llvm::opt name specifiers to all the uses of types
from that namespace.

http://llvm-reviews.chandlerc.com/D983

Files:
  include/clang/Driver/Action.h
  include/clang/Driver/CC1AsOptions.h
  include/clang/Driver/Compilation.h
  include/clang/Driver/Driver.h
  include/clang/Driver/Job.h
  include/clang/Driver/Tool.h
  include/clang/Driver/ToolChain.h
  include/clang/Frontend/CompilerInvocation.h
  lib/Driver/InputInfo.h
  lib/Driver/SanitizerArgs.h
  lib/Driver/ToolChains.h
  lib/Driver/Tools.h
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