[PATCH] Add framework for iterative compilation to clang

[Radovan Obradovic]

Hi hfinkel, atrick, chandlerc,

This patch adds command line option for iterative compilation, as well
as the code that invokes clang iteratively.
Communication between multiple runs is done over temporary files.

http://reviews.llvm.org/D4724

Files:
  include/clang/Driver/Compilation.h
  include/clang/Driver/Driver.h
  include/clang/Driver/Options.td
  lib/CodeGen/BackendUtil.cpp
  lib/Driver/Driver.cpp
  lib/Driver/Tools.cpp
  tools/driver/driver.cpp
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