substring_loc info needs default track-macro-expansion (PR preprocessor/78324)

substring_loc info needs default track-macro-expansion (PR preprocessor/78324)

gcc/ChangeLog:
	PR preprocessor/78324
	* input.c (get_substring_ranges_for_loc): Fail gracefully if
	-ftrack-macro-expansion has a value other than 2.

gcc/testsuite/ChangeLog:
	PR preprocessor/78324
	* gcc.dg/plugin/diagnostic-test-string-literals-1.c
	(test_multitoken_macro): New function.
	* gcc.dg/plugin/diagnostic-test-string-literals-3.c: New test
	case.
	* gcc.dg/plugin/diagnostic-test-string-literals-4.c: New test
	case.
	* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the new test
	cases.
	* gcc.dg/tree-ssa/builtin-sprintf-warn-1.c (test_sprintf_note):
	Move to...
	* gcc.dg/tree-ssa/builtin-sprintf-warn-4.c: ...here.  Drop
	-ftrack-macro-expansion=0.
	(test_sprintf_note): Remove "P" macro.  Add
	dg-begin/end-multiline-output directives.
	(LINE, buffer, ptr): Copy from builtin-sprintf-warn-1.c.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@242667 138bc75d-0d04-0410-961f-82ee72b054a4