Adjust reflection based optimization for SyntaxTreeCategorizedAnalyzerConfigOptions

[mavasani]

See

roslyn-analyzers/src/Utilities/Compiler/Options/SyntaxTreeCategorizedAnalyzerConfigOptions.cs

Lines 49 to 57 in 086d1cc

	static ImmutableDictionary<string, string>? TryGetBackingOptionsDictionary(AnalyzerConfigOptions analyzerConfigOptions)
	{
	// Reflection based optimization for analyzer config options.
	// Ideally 'AnalyzerConfigOptions' would expose such an the API.
	var type = analyzerConfigOptions.GetType();
	const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
	return type.GetField("_backing", flags)?.GetValue(analyzerConfigOptions) as ImmutableDictionary<string, string> ??
	type.GetField("_analyzerOptions", flags)?.GetValue(analyzerConfigOptions) as ImmutableDictionary<string, string>;
	}

dotnet/roslyn#58579 renames the backing dictionary field

[tmat]

Do we need dotnet/roslyn#41840 to remove the reflection?

[mavasani]

Yes, that will likely help.