Test on s390x.

[trivialfis]

Close #7037 .

[codecov-commenter]

Codecov Report

Merging #7038 (758df85) into master (2567404) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #7038   +/-   ##
=======================================
  Coverage   81.86%   81.86%           
=======================================
  Files          13       13           
  Lines        3916     3916           
=======================================
  Hits         3206     3206           
  Misses        710      710           

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