[PATCH] Insert random NOPs to increase security against ROP attacks (llvm)

[Stephen Crane]

  - Update to new RNG API.
  - Make NOP insertion target-independent

http://reviews.llvm.org/D3392

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/CodeGen/NOPInsertion.h
  include/llvm/CodeGen/Passes.h
  include/llvm/IR/Module.h
  include/llvm/InitializePasses.h
  include/llvm/Support/RandomNumberGenerator.h
  include/llvm/Target/TargetInstrInfo.h
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/CMakeLists.txt
  lib/CodeGen/CodeGen.cpp
  lib/CodeGen/NOPInsertion.cpp
  lib/CodeGen/Passes.cpp
  lib/IR/Module.cpp
  lib/Support/RandomNumberGenerator.cpp
  lib/Target/X86/X86InstrInfo.cpp
  lib/Target/X86/X86InstrInfo.h
  test/CodeGen/X86/nop-insert-percentage.ll
  test/CodeGen/X86/nop-insert.ll
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