c-typeck.c (comptypes_internal): Handle comparisons of INTEGER_TYPE, FIXED_POINT_TYPE, and REAL_TYPE nodes.

	* c-typeck.c (comptypes_internal): Handle comparisons of
	INTEGER_TYPE, FIXED_POINT_TYPE, and REAL_TYPE nodes.  Don't check
	TYPE_REF_CAN_ALIAS_ALL.

	* c-c++-common/attr-may-alias-1.c: New test.
	* c-c++-common/attr-may-alias-2.c: New test.
	* gcc.dg/pr39464.c: Turn dg-warning into dg-bogus.

From-SVN: r237137