Updated nvcc flags for CUDA 11

        # disable false compiler warnings

        #   reference for the -Xcudafe --diag_suppress and --display_error_number flags: https://stackoverflow.com/a/54142937

        #   incomplete list of tokens: http://www.ssl.berkeley.edu/~jimm/grizzly_docs/SSL/opt/intel/cc/9.0/lib/locale/en_US/mcpcom.msg

        set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} ; -Wno-deprecated-gpu-targets --expt-relaxed-constexpr --expt-extended-lambda -Xcudafe "\"--diag_suppress=code_is_unreachable --diag_suppress=implicit_return_from_non_void_function --diag_suppress=unsigned_compare_with_zero --diag_suppress=2906 --diag_suppress=2913 --diag_suppress=2886 --diag_suppress=2929 --diag_suppress=2977 --display_error_number\"")

        set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} ; -Wno-deprecated-gpu-targets --expt-relaxed-constexpr --expt-extended-lambda -Xcudafe --diag_suppress=code_is_unreachable -Xcudafe --diag_suppress=loop_not_reachable -Xcudafe --diag_suppress=implicit_return_from_non_void_function -Xcudafe --diag_suppress=unsigned_compare_with_zero -Xcudafe --diag_suppress=2906 -Xcudafe --diag_suppress=2913 -Xcudafe --diag_suppress=2886 -Xcudafe --diag_suppress=2929 -Xcudafe --diag_suppress=2977 -Xcudafe --diag_suppress=3057 -Xcudafe --display_error_number)

        # temporarily disable host-compler warnings about VLAs, which are caused by nvcc's modifications to the source code

        set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS} ; -Xcompiler -Wno-vla)

        # Select GPU architecture