https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120916
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> --- when we replace a stmt with sth else we should drop it's location unless it still computes the same value. That is, on the consumer side I'd expect, when I see (gdb) s i++) /* Line 9 */ (gdb) s (gdb) p i that at this point 'i' has the value after the increment. This is usually preserved as part of a DEBUG_STMT location. The actual compute stmt should end up with UNKNOWN_LOCATION if it was altered, so the question is how we distribute the debug stmts location (or the BEGIN/END_STMT debug) to actual instructions.
