Clean up MPX-related stuff.

Clean up MPX-related stuff.

2019-02-13  Martin Liska  <mliska@suse.cz>

	* builtins.h (expand_builtin_with_bounds): Remove declaration.
	* calls.c (struct arg_data): Remove special_slot, pointer_arg
	and pointer_offset fields.
	(initialize_argument_information): Remove usage of dead
	fields.
	* cgraph.h (struct cgraph_thunk_info): Remove
	add_pointer_bounds_args.
	* cgraphunit.c (cgraph_node::expand_thunk): Remove usage of dead
	fields.
	(cgraph_node::assemble_thunks_and_aliases): Remove usage of dead
	fields.
	* config/i386/i386.c (ix86_function_arg_advance): Remove
	unrelated comment.
	(struct builtin_isa): Remove leaf_p and nothrow_p fields.
	(def_builtin):  Remove usage of dead
	fields.
	(ix86_add_new_builtins): Likewise.
	* ipa-fnsummary.c (compute_fn_summary): Likewise.
	* ipa-icf.c (sem_function::equals_wpa): Likewise.
	(sem_function::init): Likewise.
	(sem_variable::merge): Likewise.
	* ipa-visibility.c (function_and_variable_visibility): Likewise.
	* ipa.c (symbol_table::remove_unreachable_nodes): Likewise.
	* lto-cgraph.c (lto_output_node): Likewise.
	(lto_output_varpool_node): Likewise.
	(input_node): Likewise.
	(input_varpool_node): Likewise.
	* lto-streamer-out.c (lto_output): Likewise.
	* tree-inline.c (expand_call_inline): Remove usage of
	assign_stmts.
	* tree-inline.h (struct copy_body_data): Likewise.
	* varpool.c (varpool_node::dump): Likewise.

From-SVN: r268844