r284060 - Implement MS _BitScan intrinsics

[Reid Kleckner via cfe-commits]

On Wed, Jun 7, 2017 at 7:31 PM, Saleem Abdulrasool <compnerd at compnerd.org>
wrote:

> I'm worried about changing this signature all the time.  I suspect that it
> will cause the following to be emitted for valid code:
>
> warning: incompatible pointer types passing 'unsigned long *' to parameter
> of type 'unsigned int *' [-Wincompatible-pointer-types]
>
> Switching the signature on LP64 sounds much better to me.
>

Right, we have to do this. It needs to be `long` on Windows.
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