[Issue 6244] Add powmod / modpow function to std.math

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=6244

--- Comment #3 from github-bugzilla at puremagic.com ---
Commits pushed to stable at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/7781aaa7b1b50858c459372b291fd80092f5ef18
Fix Issue 6244 - Add powmod / modpow function to std.math

https://github.com/dlang/phobos/commit/24cc67c1576c8da291d5812bc31279d8e871bdf2
Merge pull request #5761 from jercaianu/powmod

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