improve LongEncoding.decodeSortable()

[zhoney]

Change-Id: I4816c3db5228ccaf5f45d3779967db634d4fb7ab

[codecov]

Codecov Report

Merging #34 into master will increase coverage by 0.16%.
The diff coverage is 83.33%.

@@             Coverage Diff             @@
##             master     #34      +/-   ##
===========================================
+ Coverage     75.13%   75.3%   +0.16%     
- Complexity      492     496       +4     
===========================================
  Files            48      48              
  Lines          1653    1656       +3     
  Branches        251     252       +1     
===========================================
+ Hits           1242    1247       +5     
- Misses          299     300       +1     
+ Partials        112     109       -3

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/baidu/hugegraph/version/CommonVersion.java	50% <ø> (ø)	1 <0> (ø)	⬇️
...in/java/com/baidu/hugegraph/util/LongEncoding.java	87.27% <83.33%> (+0.73%)	19 <0> (+2)	⬆️
.../main/java/com/baidu/hugegraph/event/EventHub.java	81.94% <0%> (+1.38%)	27% <0%> (+1%)	⬆️
.../main/java/com/baidu/hugegraph/perf/Stopwatch.java	87.75% <0%> (+2.04%)	21% <0%> (+1%)	⬆️

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