bfd: optimize bfd_elf_hash

[Alan Modra]

On Sun, Apr 09, 2023 at 06:55:13PM -0400, Nathan Sidwell via Binutils wrote:
> 	* elf.c (bfd_elf_hash): Refactor to optimize loop.
> 	(bfd_elf_gnu_hash): Refactor to use 32-bit type.

Looks good to me.

-- 
Alan Modra
Australia Development Lab, IBM