alias.c (get_alias_set): Be ready for TYPE_CANONICAL of ptr_type_node to not be ptr_t...

alias.c (get_alias_set): Be ready for TYPE_CANONICAL of ptr_type_node to not be ptr_to_node.

	* alias.c (get_alias_set): Be ready for TYPE_CANONICAL
	of ptr_type_node to not be ptr_to_node.
	* tree.c (gimple_types_compatible_p): Do not match TREE_CODE of
	TREE_TYPE of pointers.
	* gimple-expr.c (useless_type_conversion): Reorder the check for
	function pointers and TYPE_CANONICAL.
	* lto.c (hash_canonical_type): Do not hash TREE_CODE of TREE_TYPE of
	pointers.
	* gfortran.dg/lto/bind_c-1_0.f90: New testcase.
	* gfortran.dg/lto/bind_c-1_1.c: New testcase.
	* gcc.dg/lto/c-compatible-types_0.c: Rename to ...
	* gcc.dg/lto/c-compatible-types-1_0.c: this one; fix template
	* gcc.dg/lto/c-compatible-types_1.c: Rename to ...
	* gcc.dg/lto/c-compatible-types-1_1.c: this one; harden for
	-fshort-enum.

From-SVN: r224201