[Diagnostics] Do not report an override warning multiple times #7704
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This PR fixes a bug I introduced in #6346. If an
@objcvariable declared in a class is overridden in an extension with computed or observed blocks, multiple errors are generated -- one for each contained decl. There is a flag passed intorecordOverridewith the intent to restrict this warning foroverride_decl_extension, but I didn't realize its purpose. I fixed the check and added tests for the various scenarios.Resolves SR-4024.