[embedded] Start flagging AllocRefDynamicInst usage in embedded Swift #70441
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IRGen for AllocRefDynamicInst uses the metadata to look up the size of the instance, but in embedded Swift we either don't have metadata at all (for structs), or they don't contain instance sizes (for class metadata). Let's start flagging AllocRefDynamicInst use in PerformanceDiagnostics to prevent IRGen compiler crashes or miscompiles.