[PATCH] Add a fence elimination pass

[Robin Morisset]

Apply clang-format, fix small style issues pointed by jfb.
I haven't done the bigger modifications yet.

http://reviews.llvm.org/D5758

Files:
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Scalar.h
  lib/Target/PowerPC/PPCTargetMachine.cpp
  lib/Transforms/Scalar/CMakeLists.txt
  lib/Transforms/Scalar/FencesPRE.cpp
  lib/Transforms/Scalar/Scalar.cpp
  test/CodeGen/PowerPC/atomics-fences-pre.ll
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