Initialize double values before calling rempio2.

R=ishell@chromium.org
BUG=chromium:421981
LOG=N

Review URL: https://codereview.chromium.org/645243003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24621 ce2b1a6d-e550-0410-aec6-3dcde31c8c00