Anna Gringauze 585f48ce55 better check for branch opt (#724) ...

* Added c++17 test configurations for clang5.0 and clang6.0

* Simplified optimization in span::operator[]

2018-08-19 16:27:30 -07:00

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gsl

better check for branch opt (#724)

2018-08-19 16:27:30 -07:00