[PATCH] Ignore annotation function calls in cost computation

[David Peixotto]

The annotation instructions are dropped during codegen and have no
impact on size.  In some cases, the annotations were preventing the
unroller from unrolling a loop because the annotation calls were
pushing the cost over the unrolling threshold.

http://reviews.llvm.org/D5335

Files:
  lib/Analysis/TargetTransformInfo.cpp
  test/Transforms/LoopUnroll/ignore-annotation-intrinsic-cost.ll
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