[PATCH] [Runtime Unrolling] use a loop to simplify the runtime unrolling prologue.

[Kevin Qin]

Hi Hal,

This updated version added unrolling disable metadata to the loop in prologue. Thanks for your advice.

Cheers,
Kevin

http://reviews.llvm.org/D5147

Files:
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/Transforms/LoopUnroll/PowerPC/a2-unrolling.ll
  test/Transforms/LoopUnroll/runtime-loop.ll
  test/Transforms/LoopUnroll/runtime-loop1.ll
  test/Transforms/LoopUnroll/runtime-loop2.ll
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