ARM: fix cctest/test-code-stub-arm.cc

TEST=cctest/test-code-stub-arm.cc
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/23843003

Patch from Rodolph Perfetta <rodolph.perfetta@gmail.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16541 ce2b1a6d-e550-0410-aec6-3dcde31c8c00