Fix x87 compile

TBR=marja@chormium.org
LOG=n
BUG=none

Review URL: https://codereview.chromium.org/337713003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21847 ce2b1a6d-e550-0410-aec6-3dcde31c8c00