c-typeck.c (process_init_element): Don't save_expr COMPOUND_LITERAL_EXPR if just its initializer will be used.

	* c-typeck.c (process_init_element): Don't save_expr
	COMPOUND_LITERAL_EXPR if just its initializer will be used.

	* gcc.dg/gnu89-init-1.c: Add new tests.

From-SVN: r48868