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update headers
SynthesizedHotReloadExceptionSymbol (#74625)
Validate pooled objects in compiler tests (#82784)
Clean up inheritance hierarchy for CSharpAttributeData/VisualBasicAttributeData. (#70519)
Propagate marked attributes to synthesized fields. (#76567)
SourceMemberMethodSymbol.IsMetadataVirtual should force complete declaring type when queried by a different module (#84013)