I believe that a relatively simple meta_query would do it.
$args = array(
'post_type' => 'post',
'meta_query' => array(
array(
'key' => '_gallery_image_ids',
'value' => '',
'compare' => 'EXISTS'
)
)
);
$query = new WP_Query( $args );
Reference:
http://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters
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