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