<random>: Implement Lemire's fast integer generation - #3012

<random>: Implement Lemire's fast integer generation#3012

Stephan T. Lavavej (StephanTLavavej) merged 12 commits into

microsoft:mainmicrosoft/STL:mainfrom

MattStephanson:gh_178_uniform_intMattStephanson/STL:gh_178_uniform_intCopy head branch name to clipboard