We now craft a new decompilation pipeline. We remove the exceptions
introduced as fallbacks to preserve the semantics, and we perform passes
of `dce` and `simplifycfg` to remove all the superfluos basic block
remaining after this change. To do this, we need an additional pass that
removes also the calls to the `llvm.assume` intrinsic, and another pass
of `dce` to remove all the dead uses.
In addition, we also remove dead stores to the `cpu_loop_exiting` global
variable in order to improve the decompiled code.
As a byproduct of this, we remove also the dependency from the
`-remove-pc-stores` pass, since its jobs is included by the changes
mentioned above.
Pietro Fezzardi