name-lookup.c (free_binding_entry): fix where the GTY markers are.

	* name-lookup.c (free_binding_entry): fix where the GTY markers are.
	(binding_entry_make): Make entry->chain NULL after getting an entry.
	fix the spelling of chain in a comment.
	(binding_table_free): speed up by having temporary variable.
	(binding_table_new): set table->chain to be NULL after allocating
	a table.
	(cxx_binding_make): use gcc_alloc instead of ggc_alloc_cleared and set
	binding->previous to NULL after getting an binding for speed.

From-SVN: r66948