Remove unused parboil benchmarks

hpvm/test/parboil/benchmarks/histo/DESCRIPTION

hpvm/test/parboil/benchmarks/histo/Makefile

hpvm/test/parboil/benchmarks/histo/histo.host.ll

hpvm/test/parboil/benchmarks/histo/histo.nvptx.s

hpvm/test/parboil/benchmarks/histo/src/base/Makefile

hpvm/test/parboil/benchmarks/histo/src/base/bmp.h

hpvm/test/parboil/benchmarks/histo/src/base/main.c

hpvm/test/parboil/benchmarks/histo/src/base/util.c

hpvm/test/parboil/benchmarks/histo/src/base/util.h

hpvm/test/parboil/benchmarks/histo/src/cuda/Makefile

hpvm/test/parboil/benchmarks/histo/src/cuda/bmp.h

hpvm/test/parboil/benchmarks/histo/src/cuda/histo_final.cu

.../parboil/benchmarks/histo/src/cuda/histo_intermediates.cu

hpvm/test/parboil/benchmarks/histo/src/cuda/histo_main.cu

hpvm/test/parboil/benchmarks/histo/src/cuda/histo_prescan.cu

hpvm/test/parboil/benchmarks/histo/src/cuda/main.cu

hpvm/test/parboil/benchmarks/histo/src/cuda/util.cu

hpvm/test/parboil/benchmarks/histo/src/cuda/util.h

hpvm/test/parboil/benchmarks/histo/src/cuda_base/Makefile

hpvm/test/parboil/benchmarks/histo/src/cuda_base/bmp.h