* merge.c (struct sec_merge_hash_entry): Add alignment field.

	* merge.c (struct sec_merge_hash_entry): Add alignment field.
	(struct sec_merge_hash): Remove alignment_power.
	(sec_merge_hash_newfunc): Clear alignment.
	(sec_merge_hash_lookup): Pass alignment as argument.
	Use hashp->root.next, not hashp->next to walk the hash chain.
	If a string already in the hashtable does not have required
	alignment, create a new hashtable entry.
	(sec_merge_init): Remove alignment_power argument.
	(sec_merge_add): Add alignment argument.
	(sec_merge_emit): Alignment is now a per-entity thing, not per
	section.
	(_bfd_merge_section): Sanity check even non-SEC_STRINGS sections
	for proper alignment.
	Pass alignment information to sec_merge_add.