adding support for Vortex GPU device

CMakeLists.txt

README.vortex

cmake/LLVM.cmake

config.h.in.cmake

lib/CL/clGetPlatformInfo.c

lib/CL/devices/CMakeLists.txt

lib/CL/devices/devices.c

lib/CL/devices/vortex/CMakeLists.txt

lib/CL/devices/vortex/kernel_args.h

lib/CL/devices/vortex/kernel_main.c

lib/CL/devices/vortex/pocl-vortex.c

lib/CL/devices/vortex/pocl-vortex.h

lib/CL/devices/vortex/vortex_utils.cc

lib/CL/devices/vortex/vortex_utils.h

lib/kernel/CMakeLists.txt

lib/kernel/vortex/CMakeLists.txt

lib/kernel/vortex/barrier.c

lib/kernel/vortex/printf.c

lib/kernel/vortex/workitems.c

lib/llvmopencl/LLVMUtils.h