[PATCH] Allow BB duplication threshold to be adjusted through JumpThreading's ctor

[Michael Liao]

Hi hfinkel,

Some targets may not want to duplicate BB when threading jumps or use different threshold. Adding threshold parameter in that pass's ctor and initializer allows customization on BB duplication.

http://reviews.llvm.org/D5444

Files:
  include/llvm/Transforms/Scalar.h
  lib/Transforms/Scalar/JumpThreading.cpp
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