Bug 86279

I added some instrumentation to see how full our HashTables were (I'll attach a patch later). I tracked the high water mark key count, and table size for each HashTable object. I browsed a few sites (cnn.com, news.bbc.co.uk, nytimes.com, reddit.com), and printed out the data. These numbers show that 99% of HashTables we create have fewer than 15 keys at high water mark. 78% have zero keys (which we optimize for).85% have 0 or 1 keys. Data: Size Freq % Cumul. % of total 0 716577 78.25% 716577 78.25% 1 60120 6.57% 776697 84.82% 2 43757 4.78% 820454 89.60% 3 25432 2.78% 845886 92.38% 4 16472 1.80% 862358 94.17% 5 13641 1.49% 875999 95.66% 6 7534 0.82% 883533 96.49% 7 5570 0.61% 889103 97.10% 8 4002 0.44% 893105 97.53% 9 4262 0.47% 897367 98.00% 10 2585 0.28% 899952 98.28% 11 2309 0.25% 902261 98.53% 12 1941 0.21% 904202 98.74% 13 1450 0.16% 905652 98.90% 14 832 0.09% 906484 98.99% 15 849 0.09% 907333 99.09% 16 704 0.08% 908037 99.16% 17 752 0.08% 908789 99.25% 18 1120 0.12% 909909 99.37% 19 555 0.06% 910464 99.43% 20 358 0.04% 910822 99.47% 21 414 0.05% 911236 99.51% 22 378 0.04% 911614 99.55% 23 317 0.03% 911931 99.59% 24 244 0.03% 912175 99.62% 25 208 0.02% 912383 99.64% 26 145 0.02% 912528 99.65% 27 118 0.01% 912646 99.67% 28 174 0.02% 912820 99.69% 29 193 0.02% 913013 99.71% 30 196 0.02% 913209 99.73% 31 132 0.01% 913341 99.74% 32 138 0.02% 913479 99.76% 33 74 0.01% 913553 99.77% 34 151 0.02% 913704 99.78% 35 71 0.01% 913775 99.79% 36 62 0.01% 913837 99.80% 37 35 0.00% 913872 99.80% 38 37 0.00% 913909 99.80% 39 44 0.00% 913953 99.81% 40 41 0.00% 913994 99.81% 41 17 0.00% 914011 99.82% 42 53 0.01% 914064 99.82% 43 36 0.00% 914100 99.83% 44 40 0.00% 914140 99.83% 45 80 0.01% 914220 99.84% 46 35 0.00% 914255 99.84% 47 42 0.00% 914297 99.85% 48 27 0.00% 914324 99.85% 49 1376 0.15% 915700 100.00%