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The concept of code_write_permission is used by tracing as well
and is not specific to code_ix.
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Make for simpler code when we just can block threads and continue
without having to release code_ix lock and repeat code lookups to
avoid race.
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Move implementation from beam_load into new file code_ix.c and module.c
and make some function inline.
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The is a refactoring in preparation to add a counter in Module struct
for export entry tracing. It is nicer if the two are kept together.
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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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Same as index_put() but returns pointer to entry instead of index integer.
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Implemented some code_ix locks
and commented calls to erts_smp_thr_progress_block()
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The ERTS internal system block functionality has been replaced by
new functionality for blocking the system. The old system block
functionality had contention issues and complexity issues. The
new functionality piggy-backs on thread progress tracking functionality
needed by newly introduced lock-free synchronization in the runtime
system. When the functionality for blocking the system isn't used
there is more or less no overhead at all. This since the functionality
for tracking thread progress is there and needed anyway.
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