Correctly resolve forcibly context allocated parameters in debug-evaluate.

R=ulan@chromium.org
BUG=325676
LOG=Y

Review URL: https://codereview.chromium.org/107243006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18402 ce2b1a6d-e550-0410-aec6-3dcde31c8c00