[PATCH][X86] __builtin_ctz/clz sometimed defined for zero input

[Chandler Carruth]

On Mon, Oct 27, 2014 at 5:02 PM, Robinson, Paul <
Paul_Robinson at playstation.sony.com> wrote:

> That makes lzcntintrin.h completely pointless.  They'd just be alternate
> names for the functions in Intrin.h.


If those names need to be supported for compatibility and portability then
it still seems to have a point.

Note that Intrin.h doesn't exist on Linux or Mac.
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