c-common.c (c_get_alias_set): Allow all type-punning through unions.

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        * c-common.c (c_get_alias_set): Allow all type-punning through
        unions.  Don't get confused about the type of a bit-field, despite
        the antics of build_modify_expr.

From-SVN: r23480

gcc/ChangeLog

+Sat Oct 31 21:42:39 1998  Mark Mitchell  <mark@markmitchell.com>
+
+	* c-common.c (c_get_alias_set): Allow all type-punning through
+	unions.  Don't get confused about the type of a bit-field, despite
+	the antics of build_modify_expr.
+
 Sat Oct 31 22:35:29 1998  Jean-Pierre Radley <jpr@jpr.com>
 
 	* fixinc.sco: Paramaterize #include_next values.