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Mingyu ZhongAntoine Pitrou
f9643a9838d
Mingyu Zhong authored and Antoine Pitrou committed 175c53d0b17
ARROW-9949: [C++] Improve performance of Decimal128::FromString by 46%, and make the implementation reusable for Decimal256.

```
Running release/arrow-decimal-benchmark
Run on (12 X 4500 MHz CPU s)
CPU Caches:
  L1 Data 32 KiB (x6)
  L1 Instruction 32 KiB (x6)
  L2 Unified 1024 KiB (x6)
  L3 Unified 8448 KiB (x1)
Load Average: 0.33, 1.08, 0.93
---------------------------------------------------------------------
Benchmark                    Time             CPU   Iterations UserCounters...
---------------------------------------------------------------------
FromString (before)        263 ns          263 ns      2666389 items_per_second=22.8378M/s
FromString (after)         180 ns          180 ns      3873651 items_per_second=33.3283M/s
```

Closes #8143 from MingyuZhong/bn4

Authored-by: Mingyu Zhong <myzhong@google.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>