[PATCH] [ADT][CMake][AutoConf] fail-fast iterators for DenseMap

[Sanjoy Das]

- Add LLVM_ENABLE_ABI_BREAKING_CHECKS to the generated config.h.  I think this is a better model since this way clients do not have to remember to add -DLLVM_ENABLE_ABI_BREAKING_CHECKS when pulling in LLVM headers.
- Add a blurb in the programmers manual.

Given that this change has received a fair amount of review already, I
plan to check the change in sometime this week in its current form
unless someone has objections or further review.


http://reviews.llvm.org/D8351

Files:
  CMakeLists.txt
  autoconf/configure.ac
  cmake/modules/HandleLLVMOptions.cmake
  configure
  docs/CMake.rst
  docs/ProgrammersManual.rst
  include/llvm/ADT/DenseMap.h
  include/llvm/ADT/EpochTracker.h
  include/llvm/Config/config.h.cmake
  include/llvm/Config/config.h.in

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