[Boost-maint] [numeric] Interval - Fix for #4964 - Assert in Debug Mode on x64

[Filip Konvička]

Hi,

I have submitted a pull-request that fixes Interval in debug mode for 
x64 (and possibly ARM).

https://github.com/boostorg/interval/pull/6

This is my first pull request; I have tried to follow the instructions, 
if anything is not correct please let me know.

Cheers,
Filip

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