re PR sanitizer/60142 ([asan] -fsanitize=address breaks debugging - stepping into functions no longer possible)

	PR sanitizer/60142
	* final.c (SEEN_BB): Remove.
	(SEEN_NOTE, SEEN_EMITTED): Renumber.
	(final_scan_insn): Don't force_source_line on second
	NOTE_INSN_BASIC_BLOCK.

From-SVN: r207853