Make sure NullDifferential and its witness are removed after autodiff.
#4958
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jkwak-work
previously approved these changes
Aug 29, 2024
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Closes #4957.
This is to make sure we always remove the
export/keepalivedecorations on the builtinNullDifferentialtype regardless of whether autodiff pass is run. To make it easy to identify this type from the linked IR, we add a[__AutoDiffBuiltin]attribute so we can easily trigger the logic to removeexportdecoration when we see this decoration.