Fix qpy custom ControlledGate with overloaded _define() (backport #8927)#8937
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This commit fixes a bug in the QPY serialization of ControlledGate subclasses that defined custom _define() methods. The _define() method is the typical way to provide a custom definition in Gate classes. While ControlledGate class provides an alternative interface that handles custom control states at initialization, but the _define() interface is still valid even if it doesn't account for this. In #8571 we updated the QPY serialization code to use the _definition() method directly to correctly handle the open control case. But this fix neglected the case where people were providing definitions via the mechanism from Gate. This commit fixes this assumption by ensuring we load the definition that comes from _define() which will fix the serialization of these custom subclasses. Fixes #8794 Co-authored-by: Jake Lishman <jake.lishman@ibm.com> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> (cherry picked from commit 3fb8939)
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jakelishman
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Oct 18, 2022
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Changelog: Fixed
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This is an automatic backport of pull request #8927 done by Mergify.
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