PR29494 Trailing jump table on ARM

out_inc_line_addr and relax_inc_line_addr are passed INT_MAX as
line_delta to flag end of section.  This filters its way down to
size_inc_line_addr and emit_inc_line_addr.  Pass line_delta on to
scale_addr_delta where it can be used to omit an unaligned opcode
error.

	PR 29494
	* dwarf2dbg.c (scale_addr_delta): Delete unnecessary forward decl.
	Add line_delta param.  Don't print error at end of section, just
	round the address down.
	(size_inc_line_addr, emit_inc_line_addr): Adjust calls.