[PATCH] LLVM intrinsic for invariants

[hfinkel at anl.gov]

Updated docs and made invariant(undef) like invariant(false) (instead of like invariant(true)).

http://reviews.llvm.org/D178

Files:
  docs/LangRef.rst
  include/llvm/IR/Intrinsics.td
  lib/Analysis/BasicAliasAnalysis.cpp
  lib/Analysis/TargetTransformInfo.cpp
  lib/CodeGen/BasicTargetTransformInfo.cpp
  lib/CodeGen/IntrinsicLowering.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/Transforms/Utils/Local.cpp
  test/Analysis/BasicAA/invariant.ll
  test/CodeGen/Generic/invariant.ll
  test/Transforms/InstSimplify/invariant.ll
  test/Transforms/SimplifyCFG/invariant.ll
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