Remove unused SupportInternalsVisibleTo flag

Drop the now-unused SupportInternalsVisibleTo state from PolyfillData and compute the type-polyfill condition directly from XmlDocumentationId in Program.cs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: meziantou

Meziantou.Polyfill.Generator/PolyfillData.cs

@@ -42,7 +42,6 @@ internal sealed partial class PolyfillData
 
     public bool UseUnsafe { get; private set; }
     public bool UseExtensions { get; private set; }
-    public bool SupportInternalsVisibleTo { get; private set; }
 
     public override string ToString()
     {
@@ -140,7 +139,6 @@ static bool IsExposed(ISymbol symbol)
         var useExtensions = root.DescendantNodes().OfType<ExtensionBlockDeclarationSyntax>().Any();
         var useUnsafe = root.DescendantNodes().OfType<UnsafeStatementSyntax>().Any() || root.DescendantNodes().OfType<MethodDeclarationSyntax>().Any(m => m.Modifiers.Any(m => m.IsKind(SyntaxKind.UnsafeKeyword)));
 
-        var supportInternalsVisibleTo = documentationDeclarationId.StartsWith("T:", StringComparison.Ordinal);
         var finalContent = new AddEmbeddedAttributeRewriter().Visit(root) ?? root;
 
         var data = new PolyfillData(finalContent.ToFullString());
@@ -150,7 +148,6 @@ static bool IsExposed(ISymbol symbol)
         data.PolyfillExtensionsClassNames = [.. polyfillExtensionsClassNames.OrderBy(x => x, StringComparer.Ordinal)];
         data.UseExtensions = useExtensions;
         data.UseUnsafe = useUnsafe;
-        data.SupportInternalsVisibleTo = supportInternalsVisibleTo;
 
         foreach (var requiredType in requiredTypes)
         {

Meziantou.Polyfill.Generator/Program.cs

@@ -241,7 +241,7 @@ string GenerateIncludePreCondition(PolyfillData data)
     string GenerateIncludePostCondition(PolyfillData data)
     {
         var result = "";
-        if (data.SupportInternalsVisibleTo && data.DeclaredMemberDocumentationIds.Length > 0)
+        if (data.XmlDocumentationId?.StartsWith("T:", StringComparison.Ordinal) == true && data.DeclaredMemberDocumentationIds.Length > 0)
         {
             result += " && (";
             result += string.Join(" && ", data.DeclaredMemberDocumentationIds.Select(member =>