[PATCH] RFC: fail-fast iterators for DenseMap

[Sanjoy Das]

Btw, this found another bug: http://reviews.llvm.org/D7988

Let's get this in tree quick! :)

On Sun, Mar 1, 2015 at 10:18 PM, Sanjoy Das
<sanjoy at playingwithpointers.com> wrote:
> Address Chandler's comments:
>
> - change vocabulary to DebugEpochBase and DebugEpochBase::HandleBase
> - move the #ifdef to outside the classes since with (1) in place, #ifdef within the classes looks confusing.
>
>
> http://reviews.llvm.org/D7931
>
> Files:
>   include/llvm/ADT/DenseMap.h
>   include/llvm/ADT/EpochTracker.h
>
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