Now that runqueue performance profiling works again we can see a lot
of time is lost in build_taskdepdata. Whilst we can't compute that
in advance, we can compute the individual entries.
Therefore put a cache in place to compute those and save overhead in
starting up tasks.
(Bitbake rev: c4519b542702ba25023e53d77b275a6fa571ec50)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
a7bbb105d3