We can optimise the loops slightly so we only process given substrings
once rather than many times. This means expanding out add_resolved_dependencies.
Also add a function which allows replacement of the task element of a
task id, reducing the amount of string handling we're doing in a performance
critical loop.
Its also clear that later code adds to the tasks depends so we don't need
to add .depends() to extradeps at the start.
(Bitbake rev: 4ad281224e92b5f94e3a9c17e8898ec8f1086cdc)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>