Do not recompile existing functions when enabling allocation tracking

Now that we don't have special hooks for the allocations in the generated code there is no need to recompile existing functions when enabling allocation tracking.

BUG=chromium:27798
LOG=N
R=loislo@chromium.org, mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/67743006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00