Merging Yifan's HPVM benchmark changes in

hpvm/CMakeLists.txt

hpvm/docs/install.rst

hpvm/lib/Transforms/DFG2LLVM_OpenCL/CMakeLists.txt

hpvm/lib/Transforms/DFG2LLVM_OpenCL/DFG2LLVM_OpenCL.cpp

hpvm/projects/hpvm-rt/CMakeLists.txt

hpvm/projects/hpvm-rt/hpvm-rt.cpp

hpvm/projects/hpvm-tensor-rt/CMakeLists.txt

hpvm/projects/torch2hpvm/torch2hpvm/compile.py

hpvm/scripts/hpvm_installer.py

hpvm/test/CMakeLists.txt

hpvm/test/benchmarks/CMakeLists.txt

hpvm/test/benchmarks/hpvm-cava/CMakeLists.txt

hpvm/test/benchmarks/hpvm-cava/Makefile

hpvm/test/benchmarks/hpvm-cava/src/main.c

hpvm/test/benchmarks/pipeline/CMakeLists.txt

hpvm/test/benchmarks/pipeline/Makefile

hpvm/test/dnn_benchmarks/hpvm-c/CMakeLists.txt

hpvm/test/dnn_benchmarks/keras/Benchmark.py

hpvm/tools/CMakeLists.txt

hpvm/tools/hpvm-clang/CMakeLists.txt