Re: [PATCH v2] Add bit operations util header

* Jeremy Kerr:

> +#if defined(__GNUC__) && \
> +    (defined(__ppc__) || defined(__powerpc__) || \
> +     defined(__ppc64__) || defined (__powerpc64__))

If you require GCC anyway, you can use __builtin_clz instead.
(It's been available since GCC 4.1 at least.)

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