[PATCH] CFL AA Tests + Minor Fix

[George Burgess IV]

Added comments as requested. I'm happy to swap the condition back if you don't agree with the change.

http://reviews.llvm.org/D5243

Files:
  lib/Analysis/CFLAliasAnalysis.cpp
  test/Analysis/CFLAliasAnalysis/arguments-globals.ll
  test/Analysis/CFLAliasAnalysis/arguments.ll
  test/Analysis/CFLAliasAnalysis/basic-interproc-ret.ll
  test/Analysis/CFLAliasAnalysis/basic-interproc.ll
  test/Analysis/CFLAliasAnalysis/multilevel-combine.ll
  test/Analysis/CFLAliasAnalysis/multilevel.ll
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