(output_decl): Check for DECL_INITIAL == NULL_TREE rather than DECL_EXTERNAL !=...
(output_decl): Check for DECL_INITIAL == NULL_TREE rather than
DECL_EXTERNAL != 0 when trying to see if we have a mere function
declaration rather than a function definition.
(dwarfout_file_scope_decl): Likewise. Also, don't bother checking
TREE_USED for file-scope functions, since it isn't 100% accurate until
the end of compilation anyway.