Change dwarf2_per_objfile::die_type_hash to htab_up

This changes dwarf2_per_objfile::die_type_hash to be an htab_up,
moving its contents off the objfile obstack.

2020-02-08  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (set_die_type, get_die_type_at_offset): Update.
	* dwarf2/read.h (struct dwarf2_per_objfile) <die_type_hash>: Now
	htab_up.

Change-Id: Ic651f99ebf71bf7ad2dc2880192adacf7b60964a


3 files changed