NVPTX -> OpenCL

hpvm/docs/compilation.md

hpvm/lib/Transforms/CMakeLists.txt

hpvm/lib/Transforms/DFG2LLVM_CPU/DFG2LLVM_CPU.cpp

hpvm/lib/Transforms/DFG2LLVM_OpenCL/CMakeLists.txt

hpvm/lib/Transforms/DFG2LLVM_OpenCL/DFG2LLVM_OpenCL.cpp

hpvm/lib/Transforms/DFG2LLVM_OpenCL/DFG2LLVM_OpenCL.exports

hpvm/lib/Transforms/DFG2LLVM_OpenCL/LLVMBuild.txt

hpvm/test/benchmarks/hpvm-cava/Makefile

hpvm/test/benchmarks/parboil/common/mk/hpvm.mk

hpvm/test/benchmarks/pipeline/Makefile

hpvm/test/benchmarks/template/Makefile

...gressionTests/DFG2LLVM_NVPTX/ThreeLevel.atomic.genvisc.ll

...test/regressionTests/DFG2LLVM_NVPTX/ThreeLevel.genvisc.ll

.../regressionTests/DFG2LLVM_NVPTX/ThreeLevel.opt.genvisc.ll