Microsoft.CodeAnalysis.Shared.Utilities.AbstractSpeculationAnalyzer<TExpressionSyntax, TTypeSyntax, TAttributeSyntax, TArgumentSyntax, TForEachStatementSyntax, TThrowStatementSyntax, TInvocationExpressionSyntax, TConversion>.IsReferenceConversion(Microsoft.CodeAnalysis.Compilation, Microsoft.CodeAnalysis.ITypeSymbol, Microsoft.CodeAnalysis.ITypeSymbol)