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Antoine PitrouWes McKinney
2c34fe81124
Antoine Pitrou authored and Wes McKinney committed e87110f174e
ARROW-3893: [C++] Improve adaptive int builder performance

The strategy is two-pronged:
- scalar append to int builder appends to a small uint64_t scratch space, deferring width detection and conversion until the scratch space is full
- bulk int width detection is much improved

Author: Antoine Pitrou <antoine@python.org>

Closes #3040 from pitrou/ARROW-3893-adaptive-int-builder-perf and squashes the following commits:

61a101b12 <Antoine Pitrou> ARROW-3893:  Improve adaptive int builder performance