omp-low.c (lookup_decl_in_outer_ctx): Allow calling this with !ctx->is_nested.

	* omp-low.c (lookup_decl_in_outer_ctx): Allow calling this
	with !ctx->is_nested.
	(maybe_lookup_decl_in_outer_ctx): Look up in outer contexts
	even if !ctx->is_nested.
	(lower_copyprivate_clauses, lower_send_clauses,
	lower_send_shared_vars): Call lookup_decl_in_outer_ctx
	unconditionally.

	* testsuite/libgomp.c/private-1.c: New test.

From-SVN: r130590