gas: xtensa: fix incorrect code generated with auto litpools

gas: xtensa: fix incorrect code generated with auto litpools

	* config/tc-xtensa.c (xtensa_maybe_create_literal_pool_frag):
	Initialize lps->frag_count with auto_litpool_limit.
	(xg_promote_candidate_litpool): New function.
	(xtensa_move_literals): Extract candidate litpool promotion code
	into separate function. Call it for all possible found
	candidates.
	(xtensa_switch_to_literal_fragment): Drop 'recursive' flag and
	call to xtensa_mark_literal_pool_location that it guards.
	Replace it with call to xtensa_maybe_create_literal_pool_frag.
	Initialize pool_location with created literal pool candidate.
	* testsuite/gas/xtensa/all.exp: Add new tests.
	* testsuite/gas/xtensa/auto-litpools-first1.d: New test results.
	* testsuite/gas/xtensa/auto-litpools-first1.s: New test.
	* testsuite/gas/xtensa/auto-litpools-first2.d: New test results.
	* testsuite/gas/xtensa/auto-litpools-first2.s: New test.
	* testsuite/gas/xtensa/auto-litpools.d: Fix offsets changed due
	to additional jump instruction.