[PATCH] CFLAA -- ConstantExpr Awareness

[George Burgess IV]

Hi dberlin, hfinkel,

// Hal already LGTM'ed an earlier version of this patch -- there are a few minor revisions that have been made to it.

Makes CFLAA aware of ConstantExpr Value*s, and how to traverse into them to get to properly handle their non-ConstantExpr parts.

Accuracy drop in tests is part of a minor bug fix where we wouldn't properly tag arguments with StratifiedAttrs if said arguments were never otherwise put in the Stratified Sets.

http://reviews.llvm.org/D8099

Files:
  lib/Analysis/CFLAliasAnalysis.cpp
  test/Analysis/CFLAliasAnalysis/asm-global-bugfix.ll
  test/Analysis/CFLAliasAnalysis/const-expr-gep.ll
  test/Analysis/CFLAliasAnalysis/stratified-attrs-indexing.ll

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