PR preprocessor/69985: fix ICE with long lines in -Wformat

PR preprocessor/69985: fix ICE with long lines in -Wformat

gcc/testsuite/ChangeLog:
	PR preprocessor/69985
	* gcc.dg/cpp/pr69985.c: New test case.

libcpp/ChangeLog:
	PR preprocessor/69985
	(linemap_position_for_loc_and_offset): Rename param from "offset"
	to "column_offset".  Right-shift the column_offset by m_range_bits
	of the pertinent ordinary map whenever offsetting a
	source_location.  For clarity, offset the column by the column
	offset, rather than the other way around.

From-SVN: r233836