[PATCH] Compute known bits using invariants

[hfinkel at anl.gov]

Same as before, but also expose the isValidInvariantForContext method for use by other passes.

http://reviews.llvm.org/D4490

Files:
  include/llvm/Analysis/InstructionSimplify.h
  include/llvm/Analysis/ValueTracking.h
  include/llvm/Transforms/Utils/Local.h
  lib/Analysis/BasicAliasAnalysis.cpp
  lib/Analysis/InstructionSimplify.cpp
  lib/Analysis/Lint.cpp
  lib/Analysis/ScalarEvolution.cpp
  lib/Analysis/ValueTracking.cpp
  lib/Transforms/InstCombine/InstCombine.h
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/InstCombine/InstCombineCasts.cpp
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
  lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
  lib/Transforms/InstCombine/InstCombineShifts.cpp
  lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  lib/Transforms/Scalar/MemCpyOptimizer.cpp
  lib/Transforms/Utils/InlineFunction.cpp
  lib/Transforms/Utils/Local.cpp
  lib/Transforms/Utils/SimplifyCFG.cpp
  test/Transforms/InstCombine/invariants-loop-align.ll
  test/Transforms/InstCombine/invariants.ll
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