[PATCH] Compute known bits using invariants (addendum)

[hfinkel at anl.gov]

Rebased.

http://reviews.llvm.org/D4543

Files:
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  test/Transforms/InstCombine/invariants2.ll
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