[PATCH] Adding diversity for security

[Julian Lettner]

  Nadav mentioned that we do not want to slow down users by adding a flag 'isInsertedNOP' to the MachineInst class and checking against it in the MachineBasicBlock::getFirstTerminator methods.

  This update addresses this concern by simply not inserting NOPs between terminators (less secure, but simplest solution for now).

Hi rinon, ahomescu,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1802?vs=4977&id=6581#toc

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/MC/MCRegisterInfo.h
  include/llvm/Support/RandomNumberGenerator.h
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/LLVMBuild.txt
  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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