[phobos] std.intrinsic and core.bitop

[unDEFER]

Hello!
Sorry if my questions are very silly, but I have the second one.
Looks like modules std.intrinsic and core.bitop have the same  
functionality and the both not marked as deprecated.
I believe that there must remains only core.bitop, but what really state  
of this modules?

Thank you.

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