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

[George Burgess IV]

Hi chandlerc, nlewycky, dberlin,

!! For the motivation for this patch, please see the primary CFL Alias Analysis patch titled "LLVM CFL Alias Analysis -- Algorithm" !!

This was split off from the primary CFL AA patch because a ~1.5KLOC review is never fun, and this can be cleanly committed prior to committing the "main" CFL AA patch.

This contains the implementation of a weighted, bidirected graph and of a stratified sets algorithm. For more information, see here: http://www.cse.cuhk.edu.hk/lyu/_media/paper/pldi2013.pdf

http://reviews.llvm.org/D4550

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