[llvm-readobj] - Add a test for --hash-table option.

We had no test for --hash-table in tools/llvm-readobj.

The one we had was in test/Object and checked that
it is possible to dump the hash table even when an object
doesn't have a section header table.

In this patch I created a test, moved and merged the existent one.
During moving I converted it to be YAML based to stop using the
precompiled binary.

Differential revision: https://reviews.llvm.org/D73105