PR32238, ld -r slowdown since 21401fc7bf

	PR 32238
	* ldlang.c (struct out_section_hash_entry): Add "tail".
	(output_section_statement_newfunc_1): New, extracted from..
	(output_section_statement_newfunc): ..here.  Init tail.
	(lang_output_section_statement_lookup): Use tail to avoid
	list traversal.