[8_10] list: perf tuning on list_contains slightly

[da-liii]

Before:

|               ns/op |                op/s |    err% |     total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
|                0.76 |    1,312,761,217.20 |    3.1% |      0.01 | `last_item 1`
|                3.07 |      325,298,326.95 |    4.5% |      0.01 | `last_item 4`
|               19.44 |       51,427,537.40 |    8.4% |      0.01 | :wavy_dash: `last_item 16` (Unstable with ~59,211.2 iters. Increase `minEpochIterations` to e.g. 592112)
|               57.67 |       17,340,734.42 |    0.7% |      0.01 | `N 32`
|                2.33 |      430,092,564.26 |    1.4% |      0.01 | `contains 1`
|               36.14 |       27,669,848.68 |    4.6% |      0.04 | `contains 16`
|               75.11 |       13,314,333.57 |    3.9% |      0.09 | `contains 32`
|               80.67 |       12,396,511.82 |    3.6% |      0.09 | `contains 64`

After:

|               ns/op |                op/s |    err% |     total | benchmark
|--------------------:|--------------------:|--------:|----------:|:----------
|                0.77 |    1,297,115,011.55 |   11.7% |      0.01 | :wavy_dash: `last_item 1` (Unstable with ~1,590,753.5 iters. Increase `minEpochIterations` to e.g. 15907535)
|                3.07 |      325,784,359.09 |    2.1% |      0.01 | `last_item 4`
|               18.64 |       53,659,753.89 |    2.0% |      0.01 | `last_item 16`
|               51.32 |       19,487,411.88 |    3.0% |      0.01 | `N 32`
|                2.24 |      446,784,980.38 |    3.8% |      0.01 | `contains 1`
|               33.65 |       29,715,032.84 |    2.6% |      0.04 | `contains 16`
|               69.80 |       14,326,172.14 |    2.9% |      0.08 | `contains 32`
|               70.98 |       14,088,835.88 |    4.3% |      0.08 | `contains 64`