re PR preprocessor/41445 (Debug information is wrong with and without --save-temps.)

	PR preprocessor/41445
	* c-ppoutput.c (do_line_change): New function.
	(cb_line_change): Use it.
	(scan_translation_unit): Call do_line_change if
	avoid_paste or PREV_WHITE and token location is on a different line
	than print.src_line.

	* gcc.dg/cpp/separate-1.c: Adjust.
	* gcc.dg/cpp/spacing1.c: Add -P to dg-options.
	* gcc.dg/debug/dwarf2/pr41445-1.c: New test.
	* gcc.dg/debug/dwarf2/pr41445-2.c: New test.
	* gcc.dg/debug/dwarf2/pr41445-3.c: New test.
	* gcc.dg/debug/dwarf2/pr41445-4.c: New test.
	* gcc.dg/debug/dwarf2/pr41445-5.c: New test.
	* gcc.dg/debug/dwarf2/pr41445-6.c: New test.

From-SVN: r152599