Remove deprecated MSBasisDecomposer transpiler pass (#9342)

This commit remove the deprecated MSBasisDecomposer transpiler pass. It was originally added as the first initial support in Qiskit for targeting ion trap backends and simply translated IBM's basis at the time (U3 and CX) to an Rx, Ry, and RXXgate basis. Since then the basis translator has completely supersceded this pass and nothing should be using it anymore (independent of the deprecation). Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>
Qiskit · Jan 9, 2023 · f0f8638 · f0f8638
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diff --git a/qiskit/transpiler/passes/basis/ms_basis_decomposer.py b/qiskit/transpiler/passes/basis/ms_basis_decomposer.py
diff --git a/releasenotes/notes/drop-ms-basis-pass-19721ea1fdfee713.yaml b/releasenotes/notes/drop-ms-basis-pass-19721ea1fdfee713.yaml
@@ -0,0 +1,9 @@
+---
+upgrade:
+  - |
+    The previously deprecated ``MSBasisDecomposer`` transpiler pass available
+    via the :mod:`qiskit.transpiler.passes` module has been removed. It was
+    originally deprecated as part of the Qiskit Terra 0.16.0 release
+    (10-16-2020). Instead the :class:`~.BasisTranslator` transpiler pass
+    should be used instead to translate a circuit into an appropriate basis
+    with a :class:`~.RXXGate`