%CompleteOptimization attempts to install optimized functions
that the parallel thread has put on the output queue, as long as
the function is marked with a builtin.  However, activating the
debugger will set all functions to the lazy recompile builtin,
without the function being on the parallel recompilation pipeline.
So we wait for the function to finish parallel recompilation
while it's marked by a builtin that's unrelated to parallel
recompilation.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/18129003

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15404 ce2b1a6d-e550-0410-aec6-3dcde31c8c00