[PATCH] In LICM, don't create more than one copy of an instruction per loop exit block when sinking.

[Evgeniy Stepanov]

Hi chandlerc,

Fixes exponential compilation complexity in PR19835.

http://llvm.org/bugs/show_bug.cgi?id=19835

http://reviews.llvm.org/D4252

Files:
  lib/Transforms/Scalar/LICM.cpp
  test/Transforms/LICM/2014-06-23-ExtraCopies.ll
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