[Issue 18734] bitnum parameter of core.bitop.bt should be signed

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18734

uplink.coder at googlemail.com changed:

           What    |Removed                     |Added
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                 CC|                            |uplink.coder at googlemail.com

--- Comment #1 from uplink.coder at googlemail.com ---
DMD does not recognize bodies only function signatures.
So change it all you like :) it's only going to be used on systems where the
intrinsic can't work.

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