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Symptom: VM on OSX (darwin11.4.2) with +Meamin running sasl tests,
crashing when init:reboot() does erlang:purge_module(installer).
Problem: Off-by-one bug in beam_ranges:find_range, returning the wrong
range if the 'end' of one module is the 'start' of the next. This is only
possible if using sys_alloc (+Meamin) as our own allocators always put
block headers between allocated payload data.
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Staging is a better and more general name as does not necessary need
to involve code loading (can be deletion, tracing, etc).
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Having the entire implementation of range handling (address table)
in one source file will help when we'll need to update the ranges
without stopping all schedulers in the next commit.
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