re PR middle-end/3074 (Statement with no effect not flagged with -Wall)

re PR middle-end/3074 (Statement with no effect not flagged with -Wall)

	PR middle-end/3074
	* fold-const.c (strip_compound_expr): Delete function.
	(count_cond): Delete function.
	(fold_binary_op_with_conditional_arg): Only perform transformations
	"a + (b?c:d) -> b ? a+c : a+d" and "(b?c:d) + a -> b ? c+a : d+a"
	when a is constant.  This greatly simplifies this routine.

	* tree.c (saved_expr_p): Delete function.
	* tree.h (saved_expr_p): Delete function prototype.

	* gcc.dg/pr3074-1.c: New test case.
	* gcc.dg/sequence-pt-1.c: Remove an XFAIL.

From-SVN: r82071