dwarf2read crash

[Andrew Cagney]

[changed to gdb-patches :-)]
Richard Henderson wrote:
> 
> GDB will currently crash whenever the child is re-run.  This due
> to failure to flush the cache created here:

> r~
> 
>         * dwarf2read.c (dwarf2_empty_hash_tables): Renamed from
>         dwarf2_empty_die_ref_table; zero dwarf2_cached_types as well.
>         Update all callers.

Yes, thanks.  It fixed the reread.exp failures. I've taken te liberty of
checking it in.

	Andrew