[PATCH v2 1/2] eal: provide leading and trailing zero bit count abstraction

[Morten Brørup]

> From: Tyler Retzlaff [mailto:roretzla at linux.microsoft.com]
> Sent: Thursday, 24 November 2022 00.43
> 
> Provide an abstraction for leading and trailing zero bit counting
> functions to hide compiler specific intrinsics and builtins.
> 
> Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
> ---

Related functions already exist in lib/eal/include/rte_common.h.

If some functions are missing, it would be good to add them.

Also, it makes sense moving them out of rte_common.h.