search for: expr_with_file_location

Hi, I'm just getting back to working on the cfe debug info after a brief hiatus. It appears that the appropriate place to be inserting stoppoints is starting in llvm_expand_stmt, using STMT_LINENO(t) . If that's not the best place, comments would be appreciated. Using the debug_hooks seems to be a non-starter, because they're called during rtl generation, which apparently isn't