[PATCH] Set edge weights in stack protector pass

[Akira Hatanaka]

The stack protector pass creates new branch instructions and basic blocks but doesn't set branch weights. This patch fixes the bug.

http://reviews.llvm.org/D5766

Files:
  include/llvm/Analysis/BranchProbabilityInfo.h
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
  lib/CodeGen/StackProtector.cpp
  test/CodeGen/X86/stack-protector-weight.ll
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