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The JIT optimizer doesn't know about _BINARY_OP_INPLACE_ADD_UNICODE's store #125912
Our abstract interpreter should have a case for _BINARY_OP_INPLACE_ADD_UNICODE, since this "special" instruction includes a store to a fast local. This can mean that the local being stored to is left with stale information (for instance, when analyzing a = ""; a += "spam" the optimizer will incorrectly assume that a still has the value "").
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GH-125912: Teach the JIT's optimizer about _BINARY_OP_INPLACE_ADD_UNI…
pythonGH-125912: Teach the JIT's optimizer about _BINARY_OP_INPLACE_A…
pythonGH-125912: Teach the JIT's optimizer about _BINARY_OP_INPLACE_A…