Implement __array__
for qasm2._DefinedGate
(backport #12119)
#12523
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Summary
Gates defined from OpenQASM 2 should have a well-defined matrix form (up to global phase) whenever all the constituent parts of the definition do. This manually makes such a matrix available.
Details and comments
Fix #12100.
This is an automatic backport of pull request #12119 done by [Mergify](https://mergify.com).