PR preprocessor/69126: avoid comparing ad-hoc and non-ad-hoc locations

PR preprocessor/69126: avoid comparing ad-hoc and non-ad-hoc locations

gcc/testsuite/ChangeLog:
	PR preprocessor/69126
	PR preprocessor/69543
	* c-c++-common/pr69126-2-long.c: New test.
	* c-c++-common/pr69126-2-short.c: New test.
	* c-c++-common/pr69543-1.c: Remove xfail.

libcpp/ChangeLog:
	PR preprocessor/69126
	PR preprocessor/69543
	* line-map.c (linemap_compare_locations): At the function top,
	replace inlined bodies of get_location_from_adhoc_loc with calls
	to get_location_from_adhoc_loc.  Add a pair of calls to
	get_location_from_adhoc_loc at the bottom of the function, to
	avoid meaningless comparisons of ad-hoc and non-ad-hoc locations.

From-SVN: r233638