Fix platform-solaris after isolate changes.

Patch from http://code.google.com/p/v8/issues/detail?id=1509.

R=ager@chromium.org
BUG=
TEST=

Review URL: http://codereview.chromium.org/7273092

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8476 ce2b1a6d-e550-0410-aec6-3dcde31c8c00