Qiskit / qiskit / 8925354283

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Commit Message

Support standalone `Var` throughout transpiler (#12322)

* Support standalone `Var` throughout transpiler

This adds the missing pieces to fully support standalone `Var` nodes
through every part of the transpiler (that I could detect).  It's quite
possible there's some problem in a more esoteric non-preset pass
somewhere, but I couldn't spot them.

For the most part there were very few changes needed to the actual
passes, and only one place in `QuantumCircuit` that had previously been
missed.  Most of the commit is updating passes to correctly pass
`inline_captures=True` when appropriate for dealing with
`DAGCircuit.compose`, and making sure that any place that needed to
build a raw `DAGCircuit` for a rebuild _without_ using
`DAGCircuit.copy_empty_like` made sure to correctly add in the
variables.

This commit adds specific tests for every pass that I touched, plus the
general integration tests that we have for the transpiler to make sure
that OQ3 and QPY serialisation work afterwards.

* Clarify comment

Run Details

26 of 29 new or added lines in 10 files covered. (89.66%)

4 existing lines in 1 file now uncovered.

61766 of 68943 relevant lines covered (89.59%)

217175.44 hits per line