Tidy Constraint.Vectorize bridge

[odow]

Interesting, but not super impressive. Maybe a 10% gain for SCS MOI scalar.

Before

 ──────────────────────────────────────────────────────────────────────────
                                   Time                   Allocations      
                           ──────────────────────   ───────────────────────
     Tot / % measured:          1.39s / 41.3%            245MiB / 100%     

 Section           ncalls     time   %tot     avg     alloc   %tot      avg
 ──────────────────────────────────────────────────────────────────────────
 SCS MOI scalar         1    364ms  63.6%   364ms    132MiB  54.0%   132MiB
   solve                1    233ms  40.8%   233ms   78.6MiB  32.0%  78.6MiB
   generate             1    131ms  22.8%   131ms   53.9MiB  22.0%  53.9MiB
 GLPK MOI vector        1   64.2ms  11.2%  64.2ms   38.7MiB  15.8%  38.7MiB
   solve                1   48.4ms  8.46%  48.4ms   16.3MiB  6.62%  16.3MiB
   generate             1   15.4ms  2.70%  15.4ms   22.4MiB  9.14%  22.4MiB
 SCS MOI vector         1   48.0ms  8.39%  48.0ms   33.6MiB  13.7%  33.6MiB
   solve                1   41.1ms  7.18%  41.1ms   25.7MiB  10.5%  25.7MiB
   generate             1   6.71ms  1.17%  6.71ms   7.92MiB  3.23%  7.92MiB
 GLPK MOI scalar        1   41.4ms  7.22%  41.4ms   23.2MiB  9.45%  23.2MiB
   solve                1   32.3ms  5.64%  32.3ms   12.5MiB  5.09%  12.5MiB
   generate             1   8.76ms  1.53%  8.76ms   10.7MiB  4.35%  10.7MiB
 SCS direct             1   34.8ms  6.08%  34.8ms   15.2MiB  6.21%  15.2MiB
   solve                1   21.7ms  3.80%  21.7ms   2.15MiB  0.88%  2.15MiB
   generate             1   13.0ms  2.28%  13.0ms   13.1MiB  5.34%  13.1MiB
 GLPK direct            1   19.8ms  3.46%  19.8ms   2.08MiB  0.85%  2.08MiB
   solve                1   12.8ms  2.24%  12.8ms     0.00B  0.00%    0.00B
   generate             1   6.47ms  1.13%  6.47ms   2.08MiB  0.85%  2.08MiB
 ──────────────────────────────────────────────────────────────────────────

After

 ──────────────────────────────────────────────────────────────────────────
                                   Time                   Allocations      
                           ──────────────────────   ───────────────────────
     Tot / % measured:          1.32s / 40.7%            238MiB / 100%     

 Section           ncalls     time   %tot     avg     alloc   %tot      avg
 ──────────────────────────────────────────────────────────────────────────
 SCS MOI scalar         1    330ms  61.3%   330ms    125MiB  52.6%   125MiB
   solve                1    207ms  38.3%   207ms   78.6MiB  33.0%  78.6MiB
   generate             1    124ms  22.9%   124ms   46.5MiB  19.5%  46.5MiB
 GLPK MOI vector        1   65.5ms  12.1%  65.5ms   38.7MiB  16.3%  38.7MiB
   solve                1   50.0ms  9.28%  50.0ms   16.3MiB  6.83%  16.3MiB
   generate             1   15.2ms  2.81%  15.2ms   22.4MiB  9.43%  22.4MiB
 SCS MOI vector         1   45.5ms  8.45%  45.5ms   33.6MiB  14.1%  33.6MiB
   solve                1   38.2ms  7.09%  38.2ms   25.7MiB  10.8%  25.7MiB
   generate             1   7.08ms  1.31%  7.08ms   7.92MiB  3.33%  7.92MiB
 GLPK MOI scalar        1   43.0ms  7.97%  43.0ms   23.2MiB  9.75%  23.2MiB
   solve                1   33.6ms  6.24%  33.6ms   12.5MiB  5.25%  12.5MiB
   generate             1   8.95ms  1.66%  8.95ms   10.7MiB  4.49%  10.7MiB
 SCS direct             1   33.3ms  6.17%  33.3ms   15.2MiB  6.41%  15.2MiB
   solve                1   21.0ms  3.89%  21.0ms   2.15MiB  0.90%  2.15MiB
   generate             1   12.3ms  2.28%  12.3ms   13.1MiB  5.50%  13.1MiB
 GLPK direct            1   21.4ms  3.97%  21.4ms   2.08MiB  0.87%  2.08MiB
   solve                1   12.5ms  2.31%  12.5ms     0.00B  0.00%    0.00B
   generate             1   8.41ms  1.56%  8.41ms   2.08MiB  0.87%  2.08MiB
 ──────────────────────────────────────────────────────────────────────────