Add support for C++0x nullptr.

	Add support for C++0x nullptr.
gcc:
	* c-common.c (c_common_reswords): Add nullptr.
	* c-common.h: Add RID_NULLPTR.  Reorganize C++0x rids.
	* dwarf2out.c (is_base_type): Handle NULLPTR_TYPE.
	(gen_type_die_with_usage): Likewise.
	* dbxout.c (dbxout_type): Likewise.
	* sdbout.c (plain_type_1): Likewise.
gcc/cp:
	* cp-tree.def: Add NULLPTR_TYPE.
	* cp-tree.h: Add nullptr_node.
	(cp_tree_index): Add CPTI_NULLPTR.
	(SCALAR_TYPE_P): Add NULLPTR_TYPE.
	* call.c (null_ptr_cst_p): Handle nullptr.
	(standard_conversion): Likewise.
	(convert_arg_to_ellipsis): Likewise.
	* mangle.c (write_type): Likewise.
	* name-lookup.c (arg_assoc_type): Likewise.
	* parser.c (cp_parser_primary_expression): Likewise.
	* typeck.c (cp_build_binary_op): Likewise.
	(build_reinterpret_cast_1): Likewise.
	* error.c (dump_type): Likewise.
	(dump_type_prefix, dump_type_suffix): Likewise.
	* decl.c (cxx_init_decl_processing): Likewise.
	* cxx-pretty-print.c (pp_cxx_constant): Likewise.
	* cvt.c (ocp_convert): Likewise.
	* rtti.c (typeinfo_in_lib_p, emit_support_tinfos): Put
	nullptr_t tinfo in libsupc++.
libstdc++-v3:
	* config/abi/pre/gnu.ver: Add typeinfo for decltype(nullptr).
libiberty:
	* cp-demangle.c (cplus_demangle_builtin_types): Add nullptr.
	(cplus_demangle_type): Handle nullptr.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159131 138bc75d-0d04-0410-961f-82ee72b054a4