[Go] Sum methods on Mac OS X panic when the array is empty

[asfimport]

If you create an empty array and use the Sum methods in the math package for the Go version, they will panic with an index out of range error.

The reproducers can be found in this file: https://github.com/influxdata/flux/blob/6ddfc0f235f91fa29562e7163ab9858f3d08cc62/arrow/arrow_test.go 

If you remove the Skip, the tests will cause a panic. I added them to our repository so we could track when this was fixed and remove our own length checks.

Reporter: Jonathan A Sternberg / @jsternberg
Assignee: Alexandre Crayssac / @alexandreyc

PRs and other links:

• GitHub Pull Request #3906

_{Note: This issue was originally created as ARROW-4081. Please see the migration documentation for further details.}

[asfimport]

Sebastien Binet / @sbinet:
Issue resolved by pull request 3906
#3906