* c-typeck.c (struct c_switch): Rename switch_stmt field to
	switch_expr.
	(c_start_case): Build SWITCH_EXPR, not SWITCH_STMT.
	(do_case): Use SWITCH_COND rather than SWITCH_STMT_COND.
	(c_finish_case): Use SWITCH_BODY rather than SWITCH_STMT_BODY.
	Call c_do_switch_expr_warnings rather than c_do_switch_warnings.
	* c-common.c (c_do_switch_warnings_1): New static function broken
	out of c_do_switch_warnings.
	(c_do_switch_warnings): Call c_do_switch_warnings_1.
	(c_do_switch_expr_warnings): New function.
	* c-common.h (c_do_switch_expr_warnings): Declare.

From-SVN: r97593