Benchmark result

Benchmark: timing 10000 iterations of perl5_28_sum, spvm_sum, spvm_sum_native, spvm_sum_precompile...
perl5_28_sum: 49 wallclock secs (48.96 usr +  0.02 sys = 48.98 CPU) @ 204.16/s (n=10000)
  spvm_sum: 27 wallclock secs (26.75 usr +  0.00 sys = 26.75 CPU) @ 373.83/s (n=10000)
spvm_sum_native:  0 wallclock secs ( 0.41 usr +  0.00 sys =  0.41 CPU) @ 24390.24/s (n=10000)
spvm_sum_precompile:  1 wallclock secs ( 0.42 usr +  0.00 sys =  0.42 CPU) @ 23809.52/s (n=10000)
                       Rate perl5_28_sum spvm_sum spvm_sum_precompile spvm_sum_native
perl5_28_sum          204/s           --     -45%                -99%            -99%
spvm_sum              374/s          83%       --                -98%            -98%
spvm_sum_precompile 23810/s       11562%    6269%                  --             -2%
spvm_sum_native     24390/s       11846%    6424%                  2%              --