Do some speedup stuff again

[xd009642]

Two performance regressions I should probably figure out (maybe just system noise though)

Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 7.8s, or reduce sample count to 60.
coverage mapping        time:   [77.426 ms 79.072 ms 81.046 ms]                             
                        change: [+6.2990% +8.8096% +11.628%] (p = 0.00 < 0.05)
                        Performance has regressed.
Found 11 outliers among 100 measurements (11.00%)
  1 (1.00%) high mild
  10 (10.00%) high severe

Benchmarking report generation: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 81.9s, or reduce sample count to 10.
report generation       time:   [806.43 ms 809.27 ms 812.17 ms]                              
                        change: [-79.923% -79.433% -78.921%] (p = 0.00 < 0.05)
                        Performance has improved.

Benchmarking subreport generation: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 12.1s, or reduce sample count to 40.
subreport generation    time:   [117.87 ms 119.28 ms 120.84 ms]                                 
                        change: [-22.306% -21.266% -20.132%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 13 outliers among 100 measurements (13.00%)
  9 (9.00%) high mild
  4 (4.00%) high severe

     Running benches/profdata_parsing.rs (target/release/deps/profdata_parsing-734518ffb23e545c)
Gnuplot not found, using plotters backend
profdata_parse_cargo    time:   [18.734 ms 19.136 ms 19.613 ms]                                 
                        change: [-22.091% -20.090% -17.694%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 12 outliers among 100 measurements (12.00%)
  3 (3.00%) high mild
  9 (9.00%) high severe

     Running benches/profraw_parsing.rs (target/release/deps/profraw_parsing-e56fea141cf59082)
Gnuplot not found, using plotters backend
Benchmarking profraw_parse_tokio: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 5.3s, or reduce sample count to 90.
profraw_parse_tokio     time:   [52.722 ms 53.620 ms 54.631 ms]                                
                        change: [-19.963% -18.530% -16.749%] (p = 0.00 < 0.05)
                        Performance has improved.
Found 17 outliers among 100 measurements (17.00%)
  3 (3.00%) low mild
  8 (8.00%) high mild
  6 (6.00%) high severe

Benchmarking profraw_parse_cargo: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 8.0s, or reduce sample count to 60.
profraw_parse_cargo     time:   [77.907 ms 78.564 ms 79.221 ms]                                
                        change: [-17.393% -16.352% -15.324%] (p = 0.00 < 0.05)
                        Performance has improved.

     Running benches/report_merging.rs (target/release/deps/report_merging-adf23cc85e45e627)
Gnuplot not found, using plotters backend
Benchmarking merge: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 23.1s, or reduce sample count to 20.
merge                   time:   [272.11 ms 279.45 ms 286.81 ms]                  
                        change: [-1.3100% +1.8348% +4.4074%] (p = 0.19 > 0.05)
                        No change in performance detected.

Benchmarking big_merge: Warming up for 3.0000 s
Warning: Unable to complete 100 samples in 5.0s. You may wish to increase target time to 1104.2s, or reduce sample count to 10.
big_merge               time:   [9.8762 s 10.127 s 10.370 s]                         
                        change: [+6.5407% +10.084% +13.882%] (p = 0.00 < 0.05)
                        Performance has regressed.