options.c (gfc_init_options): Initialize flag_argument_noalias to 3.

2006-03-21  Toon Moene  <toon@moene.indiv.nluug.nl>

	* fortran/options.c (gfc_init_options): Initialize
	flag_argument_noalias to 3.
	* doc/invoke.texi: Document new flag -fargument-noalias-anything.
	* tree-ssa-alias.c (may_alias_p): If flag_argument_noalias > 2,
	argument pointers may not alias any other storage.
	* common.opt: Define option -fargument-noalias-anything.
	* tree-ssa-structalias.c (intra_create_variable_infos): Fortran
	alias semantics is specified by flag_argument_noalias > 2.

From-SVN: r112243