[PATCH] Adding diversity for security

[Stephen Crane]

    - Replaced OpenSSL AES RNG with an MD5 HMAC_DRBG RNG
    - Updating test cases for new RNG
    - Formatting and comments for the RNG

http://llvm-reviews.chandlerc.com/D1802

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1802?vs=4930&id=4977#toc

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/CodeGen/MachineInstr.h
  include/llvm/MC/MCRegisterInfo.h
  include/llvm/Support/RandomNumberGenerator.h
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/LLVMBuild.txt
  lib/CodeGen/MachineBasicBlock.cpp
  lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
  lib/LTO/LTOCodeGenerator.cpp
  lib/LTO/LTOModule.cpp
  lib/Support/CMakeLists.txt
  lib/Support/RandomNumberGenerator.cpp
  lib/Target/X86/CMakeLists.txt
  lib/Target/X86/NOPInsertion.cpp
  lib/Target/X86/X86.h
  lib/Target/X86/X86TargetMachine.cpp
  test/CodeGen/X86/nop-insert-percentage.ll
  test/CodeGen/X86/nop-insert.ll
  test/CodeGen/X86/sched-rnd-test.ll
  tools/llc/llc.cpp
  tools/llvm-lto/llvm-lto.cpp
  tools/lto/lto.cpp
  tools/opt/opt.cpp
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