Fix SmiMove unit test.
Fix SmiMove unit test.

TEST=cctest/test-macro-assembler-x64.cc
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/25426006

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@17101 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh