d: Remove names of unused function parameters.

d: Remove names of unused function parameters.

gcc/d/ChangeLog:

	* d-attribs.cc (handle_noreturn_attribute): Remove names of unused
	function parameters.
	(handle_leaf_attribute): Likewise.
	(handle_const_attribute): Likewise.
	(handle_malloc_attribute): Likewise.
	(handle_pure_attribute): Likewise.
	(handle_novops_attribute): Likewise.
	(handle_nonnull_attribute): Likewise.
	(handle_nothrow_attribute): Likewise.
	(handle_type_generic_attribute): Likewise.
	(handle_transaction_pure_attribute): Likewise.
	(handle_returns_twice_attribute): Likewise.
	(handle_fnspec_attribute): Likewise.
	(handle_always_inline_attribute): Likewise.
	(d_handle_noinline_attribute): Likewise.
	(d_handle_forceinline_attribute): Likewise.
	(d_handle_flatten_attribute): Likewise.
	(d_handle_noclone_attribute): Likewise.
	(d_handle_section_attribute): Likewise.
	(d_handle_alias_attribute): Likewise.
	(d_handle_weak_attribute): Likewise.