function.
(set_default_source_symtab_and_line): New function. Attempts to
determine a source file to list lines from if one is not currently
defined.
(get_current_source_symtab_and_line): Initialize sal.pc and
sal.end fields.
(set_current_source_symtab_and_line): Mark argument as const.
* source.h: Update declarations and comments.
* linespec.c (decode_line_1): Replace call to removed routine above.
* stack.c (print_frame_info_base): Ditto.
* cli/cli-cmds.c (edit_command): Ditto.
(list_command): Ditto.
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