* calls.c (special_function_p, setjmp_call_p, alloca_call_p,
	flags_from_decl_or_type): Constify.
	* gcc.c (do_spec_1): Likewise.
	* print-tree.c (dump_addr, print_node_brief): Likewise.
	* tree-cfg.c (stmt_starts_bb_p, is_ctrl_stmt, computed_goto_p,
	simple_goto_p, tree_can_make_abnormal_goto, stmt_starts_bb_p,
	tree_purge_all_dead_eh_edges): Likewise.
	* tree-flow.h (is_ctrl_stmt, computed_goto_p, simple_goto_p,
	tree_can_make_abnormal_goto, tree_purge_all_dead_eh_edges):
	Likewise. 
	* tree.c (expr_location, expr_has_location, expr_locus,
	expr_filename, expr_lineno, get_inner_array_type,
	fields_compatible_p): Likewise.
	* tree.h (get_inner_array_type, fields_compatible_p,
	expr_location, expr_has_location, expr_locus, expr_filename,
	expr_lineno, dump_addr, print_node_brief, flags_from_decl_or_type,
	setjmp_call_p, alloca_call_p): Likewise.

From-SVN: r127017