[PATCH] Fix bug causing loop unrolling to be disabled in some cases for loops with '#pragma clang loop unroll_count(N)"

[Mark Heffernan]

Thanks!  Test added.  Will lead with that next time ;-)

http://reviews.llvm.org/D4662

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Transforms/LoopUnroll/unroll-pragmas-disabled.ll
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