Use MAX, MIN, and ROUND_UP macros to simplify code.
Build and reg-tested on x86_64 with nvptx accelerator.
2018-12-19 Tom de Vries <tdevries@suse.de>
* config/nvptx/nvptx.c (nvptx_gen_shared_bcast, shared_prop_gen)
(nvptx_goacc_expand_accel_var): Use MAX and ROUND_UP.
(nvptx_assemble_value, nvptx_output_skip): Use MIN.
(nvptx_shared_propagate, nvptx_single, nvptx_expand_shared_addr): Use
MAX.