llvm dev - Aug 2018 - How to proceed to each of the optimization steps after forcing your stop.

How to proceed for each of the optimization steps after using the command
"-mllvm -disable-llvm-optzns test -Emit-llvm -c -S" and get an output
file
between the optimization steps.

Also, if you can not do this how you could do the extraction of a CFG
(Control flow graph), between all the steps of the optimization process.
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