Speed up filtered disjunctions by loading the filter into a bit set.

[jpountz]

This helps skip the overhead of reordering the heap on every doc, so the benefit is especially visible with many clauses.

[jpountz]

All filtered disjunctions but FilteredOr2Terms2StopWords get a speedup:

                            TaskQPS baseline      StdDevQPS my_modified_version      StdDev                Pct diff p-value
      FilteredOr2Terms2StopWords      151.97      (0.9%)      144.44      (0.8%)   -5.0% (  -6% -   -3%) 0.000
                     OrStopWords       33.54      (8.5%)       33.10      (9.5%)   -1.3% ( -17% -   18%) 0.716
                        Or3Terms      174.11      (5.0%)      172.37      (5.9%)   -1.0% ( -11% -   10%) 0.641
                 DismaxOrHighMed       87.67      (4.6%)       86.85      (3.4%)   -0.9% (  -8% -    7%) 0.556
              Or2Terms2StopWords      163.99      (5.0%)      162.75      (5.8%)   -0.8% ( -10% -   10%) 0.720
                  FilteredPhrase       26.21      (2.5%)       26.07      (3.1%)   -0.5% (  -5% -    5%) 0.633
                    AndStopWords       30.02      (6.2%)       29.86      (5.6%)   -0.5% ( -11% -   12%) 0.826
                      OrHighHigh       53.85      (1.2%)       53.62      (2.1%)   -0.4% (  -3% -    2%) 0.531
                    CombinedTerm       32.39      (3.0%)       32.27      (4.4%)   -0.4% (  -7% -    7%) 0.805
                       OrHighMed      200.12      (1.1%)      199.54      (1.8%)   -0.3% (  -3% -    2%) 0.626
                 AndHighOrMedMed       46.77      (0.9%)       46.63      (2.1%)   -0.3% (  -3% -    2%) 0.650
                 CountOrHighHigh       76.39      (0.6%)       76.17      (0.7%)   -0.3% (  -1% -    1%) 0.285
             FilteredAndHighHigh       63.19      (1.5%)       63.05      (1.6%)   -0.2% (  -3% -    2%) 0.716
                 CountAndHighMed      170.83      (1.4%)      170.46      (1.4%)   -0.2% (  -3% -    2%) 0.701
                DismaxOrHighHigh       70.86      (4.4%)       70.75      (3.1%)   -0.1% (  -7% -    7%) 0.922
                       CountTerm     9302.53      (3.7%)     9291.97      (4.0%)   -0.1% (  -7% -    7%) 0.940
                  CountOrHighMed      144.44      (1.1%)      144.29      (1.0%)   -0.1% (  -2% -    2%) 0.795
              FilteredAndHighMed      127.09      (2.8%)      126.96      (2.6%)   -0.1% (  -5% -    5%) 0.926
            FilteredAndStopWords       49.12      (1.7%)       49.08      (2.0%)   -0.1% (  -3% -    3%) 0.903
                       And3Terms      170.32      (4.0%)      170.20      (4.0%)   -0.1% (  -7% -    8%) 0.963
                CountAndHighHigh       58.02      (1.0%)       57.98      (1.3%)   -0.1% (  -2% -    2%) 0.904
                      DismaxTerm      648.52      (3.3%)      648.23      (3.4%)   -0.0% (  -6% -    6%) 0.973
                AndMedOrHighHigh       59.68      (0.7%)       59.72      (1.5%)    0.1% (  -2% -    2%) 0.892
                          OrMany       19.73      (5.7%)       19.74      (5.4%)    0.1% ( -10% -   11%) 0.976
             And2Terms2StopWords      160.42      (4.0%)      160.73      (3.5%)    0.2% (  -6% -    7%) 0.895
               FilteredAnd3Terms      193.11      (1.7%)      193.54      (1.6%)    0.2% (  -3% -    3%) 0.739
     FilteredAnd2Terms2StopWords      198.70      (1.4%)      199.50      (1.4%)    0.4% (  -2% -    3%) 0.454
                     AndHighHigh       42.13      (1.4%)       42.31      (1.2%)    0.4% (  -2% -    3%) 0.413
                      AndHighMed      123.75      (1.0%)      124.35      (1.3%)    0.5% (  -1% -    2%) 0.279
              CombinedAndHighMed       56.43      (1.6%)       56.77      (2.1%)    0.6% (  -3% -    4%) 0.412
             CombinedAndHighHigh       15.45      (1.5%)       15.54      (1.9%)    0.6% (  -2% -    4%) 0.348
                      OrHighRare      281.45      (6.0%)      283.37      (6.6%)    0.7% ( -11% -   14%) 0.782
                     CountPhrase        4.49      (1.5%)        4.52      (1.1%)    0.7% (  -1% -    3%) 0.172
                        PKLookup      281.29      (1.6%)      284.30      (1.5%)    1.1% (  -2% -    4%) 0.082
                    FilteredTerm      160.14      (2.8%)      161.98      (2.1%)    1.1% (  -3% -    6%) 0.238
                FilteredOr3Terms      170.41      (0.8%)      172.42      (1.3%)    1.2% (   0% -    3%) 0.007
              CombinedOrHighHigh       18.28      (3.8%)       18.56      (4.8%)    1.6% (  -6% -   10%) 0.358
               CombinedOrHighMed       69.85      (4.1%)       70.95      (5.2%)    1.6% (  -7% -   11%) 0.388
             FilteredOrStopWords       44.83      (1.8%)       47.08      (2.9%)    5.0% (   0% -    9%) 0.000
              FilteredOrHighHigh       66.63      (1.2%)       70.79      (1.9%)    6.2% (   3% -    9%) 0.000
               FilteredOrHighMed      158.80      (0.8%)      170.21      (1.2%)    7.2% (   5% -    9%) 0.000
                  FilteredOrMany       16.89      (4.0%)       25.68      (1.1%)   52.1% (  45% -   59%) 0.000