Ported histo for opencl cpu

...parboil/benchmarks/histo/src/opencl_cpu_baseline/Makefile

...enchmarks/histo/src/opencl_cpu_baseline/OpenCL_common.cpp

.../benchmarks/histo/src/opencl_cpu_baseline/OpenCL_common.h

...SC/parboil/benchmarks/histo/src/opencl_cpu_baseline/bmp.h

...l/benchmarks/histo/src/opencl_cpu_baseline/histo_final.cl

...arks/histo/src/opencl_cpu_baseline/histo_intermediates.cl

...il/benchmarks/histo/src/opencl_cpu_baseline/histo_main.cl

...benchmarks/histo/src/opencl_cpu_baseline/histo_prescan.cl

...arboil/benchmarks/histo/src/opencl_cpu_baseline/kernel.cl

...il/benchmarks/histo/src/opencl_cpu_baseline/kernel_x64.ll

.../benchmarks/histo/src/opencl_cpu_baseline/kernel_x64.spir

...parboil/benchmarks/histo/src/opencl_cpu_baseline/main.cpp

...parboil/benchmarks/histo/src/opencl_cpu_baseline/util.cpp

...C/parboil/benchmarks/histo/src/opencl_cpu_baseline/util.h

.../VISC/parboil/benchmarks/histo/src/opencl_nvidia/main.cpp