microblaze: fix PR65649

microblaze-linux-musl build fails without this.

(This is a rebase of an earlier patch posted on bugzilla.)

gcc/ChangeLog:

2019-11-15  Nick Clifton  <nickc@redhat.com>
	    Szabolcs Nagy  <szabolcs.nagy@arm.com>

	PR target/65649
	* config/microblaze/microblaze.c (print_operand): Print value as long.

Co-Authored-By: Szabolcs Nagy <szabolcs.nagy@arm.com>

From-SVN: r278308