[arm] Remove code duplication in instruction selector. Refactoring.

TEST=unittests
R=dcarney@chromium.org

Review URL: https://codereview.chromium.org/719713002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25292 ce2b1a6d-e550-0410-aec6-3dcde31c8c00