By Daina Beth Solomon and Ted Hesson LOS ANGELES/WASHINGTON (Reuters) -Leaders attending the Summit of the Americas are poised to issue a declaration pledging measures to curb illegal migration and help countries receiving large number of migrants to cope with them, according to a draft document seen by Reuters on Thursday. The document, dated both June 6 and June 7, included commitments to work on convening banks to review their financial instruments for migrant-hosting countries, as well as improving migrants’ access to public and private services. It also lists pledges by Western hemisphere…