* linker.c (generic_link_add_symbol_list): Skip constructor

	* linker.c (generic_link_add_symbol_list): Skip constructor
	symbols which the main linker code did not do anything with.
	(_bfd_generic_link_output_symbols): Use udata.p if it is set,
	rather than looking the symbol up in the hash table.  Just pass
	through constructor symbols for which udata.p is not set.  If the
	linker defined the symbol, clear the constructor flag.
Fix -r for b.out file format when constructor symbols are defined.