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Kazuaki IshizakiAntoine Pitrou
4d39b82a448
Kazuaki Ishizaki authored and Antoine Pitrou committed 25299e5424d
ARROW-4018: [C++] Fix RLE tests' failures on big-endian platforms

This PR adds big-endian support in RLE related classes. The data for RLE is stored using a little-endian format. The current code assumes a little-endian CPU in two places.
1. `RleDecoder::NextCounts` (fix was proposed in ARROW-4018)
1. packing and unpacking from https://github.com/lemire/FrameOfReference/blob/6ccaf9e97160f9a3b299e23a8ef739e711ef0c71/src/bpacking.cpp

After applying #7136 & this PR, the following failures in arrow-utility-test's failures will be fixed.
```
[  FAILED  ] Rle.SpecificSequences
[  FAILED  ] Rle.TestValues
[  FAILED  ] BitRle.Flush
[  FAILED  ] BitRle.Random
[  FAILED  ] BitRle.RepeatedPattern
[  FAILED  ] BitRle.Overflow
[  FAILED  ] RleDecoder.GetBatchSpaced
```

Closes #7144 from kiszk/ARROW-4018

Authored-by: Kazuaki Ishizaki <ishizaki@jp.ibm.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>