[PATCH] RFC: fail-fast iterators for DenseMap

[Sanjoy Das]

Address Chandler's review.

- no "ADT" in the file or class names.
- changed the vocabulary to "Handle" and "Host"
- suffixed the class names with "Base" and change the DenseMap implementation to use inheritance over composition.
- handled the NDEBUG-only-ness directly in the header file.  Once this was locked down, I could not justify the additional complexity from the template specialization, so I removed that too.


http://reviews.llvm.org/D7931

Files:
  include/llvm/ADT/DenseMap.h
  include/llvm/ADT/EpochTracker.h

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