Implement Py3.9 LCM and GCD#1916

Merged

palaviv merged 3 commits intoRustPython:masterfrom

TheAnyKey:TheAnyKey/p39_math_pr

May 15, 2020

Commits on May 8, 2020

Implement LCM and GCD from Py3.9; merged from TheAnyKey/p39_math
TheAnyKey
committed
imported tests from cpython 3.6a5 for math. skipping all failing tests
TheAnyKey
committed

Commits on May 10, 2020

simplified implementation and commented tests
TheAnyKey
committed