ART: Fix opsize in LoadArgDirect

If the destination register is a reference, use kReference for the
op size.

Bug: 22244733

(cherry picked from commit 185a5586c8b796e770e9b4b7ac2befa8ccdaca7e)

Change-Id: Idf52f2ee4c65b5dc41cb66257d95281dc6f32255
4 files changed