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This commit refactors the IteRemoval pass to follow the new format.
In addition to moving the code, this entails the following changes:
- The timer for the ITE removal is now called differently (the default
timer of PreprocessingPass is used) and measures just the
preprocessing pass without applySubstitutions(). It also measures the
time used by both invocations of the ITE removal pass.
- Debug output will be slightly different because we now just rely on
the default functionality of PreprocessingPass.
- d_iteRemover is now passed into the PreprocessingPassContext.
- AssertionPipeline now owns the d_iteSkolemMap, which makes it
accessible by preprocessing passes. The idea behind this is that the
preprocessing passes collect information in AssertionPipeline and
d_iteSkolemMap fits that pattern.
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This commit refactors the pbRewrites preprocessing pass into the new
style. This commit is essentially just a code move and adds a regression
test for the preprocessing pass. It also makes use of the
AssertionPipeline::replace function to do proper dependency tracking.
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This commit adds new infrastructure for preprocessing passes. It is preparation only, it does not change how the current preprocessing passes work (this will be done in future commits).
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