[llvm-readobj] - Improve test of --elf-hash-histogram option.

This test missed the check of histograms printed for .hash sections.
It was removed by mistake in D71606 where I tried to get rid of precompiled objects
and did not realize that time that both SHT_GNU_HASH and SHT_HASH sections
were tested and not just GNU version.

Also it never tested aliases for the --elf-hash-histogram option.

Differential revision: https://reviews.llvm.org/D76920