loop unrolling: Use type of original expression (#3420)
loop unrolling: Use type of original expression (#3420)

Signed-off-by: Mihai Budiu <80f34b4fcd5b9ba05c28cad718c56aec2280395d@vmware.com>
p4lang/p4c,p4lang/p4c,p4lang/p4c,p4lang/p4c,p4lang/p4c