grokdump: Compute correct call destinations and display them in-place

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/148493008

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18984 ce2b1a6d-e550-0410-aec6-3dcde31c8c00