[PATCH] Emit a trap instruction for IR 'unreachable'

[Yaron Keren]

  With test.

Hi asl, martell, vadimcn, Kai, nrieck, rnk, dblaikie, theraven, chandlerc,

http://reviews.llvm.org/D3417

CHANGE SINCE LAST DIFF
  http://reviews.llvm.org/D3417?vs=8650&id=8663#toc

Files:
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/SelectionDAG/FastISel.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/Target/X86/X86TargetMachine.cpp
  test/CodeGen/X86/br-fold.ll
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