[PATCH] [BasicAA] Fix zext & sext handling

[Nick White]

[BasicAA] Fix zext & sext handling

There are several unhandled edge cases in BasicAA's GetLinearExpression method. This changes fixes outstanding issues, including zext / sext of a constant with the sign bit set, and the refusal to decompose zexts or sexts of wrapping arithmetic.


http://reviews.llvm.org/D6682

Files:
  lib/Analysis/BasicAliasAnalysis.cpp
  test/Analysis/BasicAA/q.bad.ll

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