* cp-tree.h (LAMBDA_CAPTURE_EXPLICIT_P)
	(LAMBDA_EXPR_CAPTURE_OPTIMIZED): New.
	* expr.c (mark_use): Set LAMBDA_EXPR_CAPTURE_OPTIMIZED.
	* lambda.c (is_constant_capture_proxy)
	(current_lambda_expr, var_to_maybe_prune, mark_const_cap_r)
	(prune_lambda_captures): New.
	(finish_lambda_function): Call prune_lambda_captures.

From-SVN: r258398