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David LiPaddy Horan
9c2694e615d
David Li authored and Paddy Horan committed 62403aa08a4
ARROW-3643: [Rust] optimize BooleanBufferBuilder::append_slice

Performance difference: ~15%

```
bench_bool              time:   [2.6103 ms 2.6278 ms 2.6474 ms]
                        thrpt:  [188.86 MiB/s 190.27 MiB/s 191.55 MiB/s]
                 change:
                        time:   [-16.950% -15.811% -14.657%] (p = 0.00 < 0.05)
                        thrpt:  [+17.174% +18.781% +20.410%]
                        Performance has improved.
Found 4 outliers among 100 measurements (4.00%)
  3 (3.00%) high mild
  1 (1.00%) high severe
```

Travis-CI: https://travis-ci.com/lihalite/arrow/builds/126254420

Closes #5310 from lihalite/arrow-3643 and squashes the following commits:

b9daf32f7 <David Li> ARROW-3643:  optimize BooleanBufferBuilder::append_slice

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Paddy Horan <paddyhoran@hotmail.com>