[PATCH] Remove unroll pragma metadata after it is used

[Mark Heffernan]

Hi eliben,

This change causes the loop unroller to remove unroll pragma metadata after it is used.  This prevents a loop from being unrolled more than is directed by a pragma if the loop
unrolling pass is run more than once which it generally is.

http://reviews.llvm.org/D4571

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