Reverse range adapter

[Pete Cooper]

Hi David

Please find attached a patch for a reverse range adapter.  Its based on feedback you gave in http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150720/289410.html <http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150720/289410.html>.

There are 2 versions.  The first uses rbegin()/rend(), the second constructs std::reverse_iterators around begin()/end().

I was surprised to find I didn’t need enable_if or any other such tricks.

I’ve updated a single use of the pattern ‘for auto x : make_range(rbegin(), rend())’ to the new reverse method.

I was considering reverse_range instead as a name to avoid confusion with std::reverse.  I’d prefer to not do make_reverse_range just to save on characters.

Feedback welcome.

Cheers,
Pete

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