Patch for increasing simple_one_for_one supervisors efficiency

[Alexey Shchepin]

Hi!

Please, apply this patch to supervisor.erl to increase efficiency of
simple_one_for_one supervisors.  Currently #state.dynamics uses orddict-similar
implementation, and this patch replaces it with implementation that use dict
module.  Without this patch supervisor was the biggest bottleneck during some
ejabberd benchmarks.

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