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Fixes 2887.
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Before refactoring the preprocessing passes, we were using three
arguments to add assertions to the decision engine. Now all that
information lives in the AssertionPipeline. This commit moves the
AssertionPipeline to its own file and changes the `addAssertions()`
methods related to the decision engine to take an AssertionPipeline as
an arguement instead of three separate ones. Additionally, the
TheoryEngine now uses an AssertionPipeline for lemmas.
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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 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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