Remove unused decimal floating-point pointer types

Remove unused decimal floating-point pointer types

	gcc/
	* builtin-types.def (BT_DFLOAT32_PTR, BT_DFLOAT64_PTR,
	BT_DFLOAT128_PTR) Remove.
	* tree-core.h (TI_DFLOAT32_PTR_TYPE, TI_DFLOAT64_PTR_TYPE,
	TI_DFLOAT128_PTR_TYPE): Remove.
	* tree.c (build_common_type_nodes): Remove dfloat32_ptr_type_node,
	dfloat64_ptr_type_node and dfloat128_ptr_type_node initialisation.
	* tree.h (dfloat32_ptr_type_node, dfloat64_ptr_type_node,
	dfloat128_ptr_type_node): Remove macros.

	gcc/jit/
	* jit-builtins.c (BT_DFLOAT32_PTR, BT_DFLOAT64_PTR, BT_DFLOAT128_PTR):
	Remove commented-out cases.

Reviewed-by: Joseph Myers <joseph@codesourcery.com>
From-SVN: r278826