[PATCH] Enable runtime unrolling with unroll pragma metadata

[Mark Heffernan]

Hi hfinkel,

Enable runtime unrolling for loops with unroll full metadata ("#pragma unroll")
and a runtime trip count.  For these loops the default unroll threshold limit is
used. Previously loops marked with "#pragma unroll" and a runtime trip count
would not be unrolled unless the -unroll-runtime command line flag was also
given. An additional affect of this change is that loops with the unroll count
metadata ("#pragma unroll N") and a runtime loop count will use the runtime loop
unroller in LoopUnrollRuntime.cpp which can generate more efficient code.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10854

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

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