[PATCH] Adding diversity for security

[Julian Lettner]

  The updated replaces the custom RNG implementation with C++11 facilities.
  Andrew Trick made good suggestions on how to improve the patch.
  I will try to incorporate those (starting with splitting RNG - NOP insertion - schedule randomization int separate patches).

Hi rinon, ahomescu,

http://reviews.llvm.org/D1802

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D1802?vs=6621&id=8499#toc

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Support/RandomNumberGenerator.h
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
  lib/LTO/LTOCodeGenerator.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
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