Use new Tree functions internally

[meooow25]

Closes #1244

[meooow25]

Benchmarks with GHC 9.14:

Name                                         Time - - - - - - - -    Allocated - - - - -
                                                  A       B     %         A       B     %
bcc.line,n=100                               3.7 μs  3.7 μs   +0%     49 KB   49 KB   +0%
bcc.line,n=1000000                           323 ms  326 ms   +0%    632 MB  632 MB   +0%
bcc.maxDAG,n=15                              778 ns  779 ns   +0%    7.2 KB  7.2 KB   +0%
bcc.maxDAG,n=1500                            6.6 ms  7.3 ms   +9%    748 KB  748 KB   +0%
bcc.rand,n=100,m=1000                        6.1 μs  6.1 μs   +0%     44 KB   44 KB   +0%
bcc.rand,n=100,m=10000                        53 μs   53 μs   +1%     45 KB   45 KB   +0%
bcc.rand,n=10000,m=100000                    2.8 ms  3.0 ms   +7%    5.4 MB  5.4 MB   +0%
bcc.rand,n=100000,m=1000000                   54 ms   54 ms   -1%     54 MB   54 MB   +0%
bcc.star,n=100                               3.1 μs  3.1 μs   +0%     48 KB   48 KB   +0%
bcc.star,n=1000000                            74 ms  116 ms  +55%    489 MB  489 MB   +0%
scc.line,n=100                               2.4 μs  2.2 μs   -7%     29 KB   24 KB  -18%
scc.line,n=1000000                           175 ms  178 ms   +2%    330 MB  277 MB  -16%
scc.maxDAG,n=15                              863 ns  836 ns   -3%    8.0 KB  7.2 KB  -10%
scc.maxDAG,n=1500                             39 ms   41 ms   +3%     43 MB   43 MB   +0%
scc.rand,n=100,m=1000                        7.8 μs  7.6 μs   -2%     64 KB   59 KB   -8%
scc.rand,n=100,m=10000                        83 μs   85 μs   +1%    416 KB  410 KB   -1%
scc.rand,n=10000,m=100000                    3.8 ms  3.9 ms   +2%    7.5 MB  7.2 MB   -4%
scc.rand,n=100000,m=1000000                  116 ms  110 ms   -5%     75 MB   72 MB   -4%
scc.star,n=100                               2.4 μs  2.2 μs   -7%     29 KB   24 KB  -18%
scc.star,n=1000000                           193 ms  170 ms  -11%    330 MB  277 MB  -16%
stronglyConnCompR.line,n=100                 6.2 μs  6.1 μs   -2%     60 KB   55 KB   -9%
stronglyConnCompR.line,n=1000000             402 ms  386 ms   -3%    628 MB  574 MB   -8%
stronglyConnCompR.maxDAG,n=15                2.8 μs  2.7 μs   -3%     20 KB   19 KB   -4%
stronglyConnCompR.maxDAG,n=1500              113 ms  100 ms  -11%    121 MB  121 MB   +0%
stronglyConnCompR.rand,n=100,m=1000           27 μs   26 μs   -3%    160 KB  155 KB   -3%
stronglyConnCompR.rand,n=100,m=10000         496 μs  497 μs   +0%    1.1 MB  1.1 MB   +0%
stronglyConnCompR.rand,n=10000,m=100000       17 ms   17 ms   +0%     17 MB   16 MB   -2%
stronglyConnCompR.rand,n=100000,m=1000000    343 ms  355 ms   +3%    166 MB  163 MB   -2%
stronglyConnCompR.star,n=100                 6.3 μs  6.0 μs   -3%     60 KB   55 KB   -9%
stronglyConnCompR.star,n=1000000             373 ms  410 ms   +9%    628 MB  574 MB   -8%
topSort.line,n=100                           1.5 μs  1.3 μs  -13%     20 KB   14 KB  -27%
topSort.line,n=1000000                       155 ms  131 ms  -15%    254 MB  225 MB  -11%
topSort.maxDAG,n=15                          349 ns  331 ns   -5%    3.0 KB  2.2 KB  -27%
topSort.maxDAG,n=1500                        3.4 ms  3.4 ms   -1%    326 KB  243 KB  -25%
topSort.rand,n=100,m=1000                    2.8 μs  2.6 μs   -6%     20 KB   14 KB  -27%
topSort.rand,n=100,m=10000                    25 μs   28 μs  +10%     20 KB   14 KB  -27%
topSort.rand,n=10000,m=100000                1.4 ms  1.4 ms   +0%    2.4 MB  2.1 MB  -14%
topSort.rand,n=100000,m=1000000               34 ms   24 ms  -29%     24 MB   21 MB  -13%
topSort.star,n=100                           1.3 μs  1.1 μs  -14%     20 KB   14 KB  -27%
topSort.star,n=1000000                        66 ms   64 ms   -3%    215 MB  161 MB  -24%

topSort is a little better. bcc is unaffected (was regressing without #1245).