[PATCH] A bit-tracking DCE Pass

[hfinkel at anl.gov]

Added a few more regression tests.


http://reviews.llvm.org/D7531

Files:
  include/llvm-c/Transforms/Scalar.h
  include/llvm/InitializePasses.h
  include/llvm/LinkAllPasses.h
  include/llvm/Transforms/Scalar.h
  lib/Transforms/IPO/PassManagerBuilder.cpp
  lib/Transforms/Scalar/BDCE.cpp
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/Scalar.cpp
  test/Transforms/BDCE/basic.ll
  test/Transforms/BDCE/dce-pure.ll

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