* wrstabs.c (struct string_hash_entry): Add next field.

	* wrstabs.c (struct string_hash_entry): Add next field.
	(struct stab_write_handle): Change strings to a pointer to
	string_hash_entry.  Add last_strings field.  Remove strings_alloc
	field.
	(string_hash_newfunc): Initialize next field.
	(stab_write_symbol): Copy string into hash table rather than into
	buffer.  Keep a list of hash table entries.
	(write_stabs_in_sections_debugging_info): Initialize last_string.
	Copy strings from list of hash table entries in memory.
	(stab_modify_type): If the entry on the stack is a definition,
	make a new definition rather than failing an assert.
	(stab_array_type): The size is only zero if high is strictly less
	than low.
PR 10377.