[PATCH] LLVM CFL Alias Analysis -- Supporting Data Structures

[George Burgess IV]

Addressed dberlin's comments, swapped std::map->DenseMap and std::set->DenseSet, and took out some unnecessary headers.

http://reviews.llvm.org/D4550

Files:
  lib/Analysis/StratifiedSets.h
  lib/Analysis/WeightedBidirectedGraph.h
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