Fix a crash involving [SetsRequiredMembers] and required property using field keyword on a base type
#82136
+84
−4
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Closes #80504
We may analyze the state of a base property on exit, when it is required, and the constructor has SetsRequiredMembers. In this case we need to take care to ignore a backing field, even if the property uses the field keyword. This is because we want the analysis of the constructor in the subtype to behave similarly regardless of whether the base type comes from source or metadata.