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Damien George authored
NLR buffers are usually quite large (use lots of C stack) and expensive to push and pop. Some of the time they are only needed to perform clean up if an exception happens, and then they re-raise the exception. This commit allows optimizing that scenario by introducing a linked-list of NLR callbacks that are called automatically when an exception is raised. They are essentially a light-weight NLR handler that can implement a "finally" block, i.e. clean-up when an exception is raised, or (by passing `true` to nlr_pop_jump_callback) when execution leaves the scope. Signed-off-by: Damien George <damien@micropython.org>
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