Ignore @private/@protected on constructor functions (#35782)

* Ignore @private on constructor functions

This was incorrect in the best of circumstances and caused a crash when
the parent of the function had no symbol, because the accessibility
check assumed it was operating on a constructor and that the parent was
always the containing class.

* Non-constructors are always accessible

Previously, all function-like kinds were accessible, which includes
constructors. This was wrong.

src/compiler/checker.ts

@@ -24865,8 +24865,8 @@ namespace ts {
             const declaration = signature.declaration;
             const modifiers = getSelectedModifierFlags(declaration, ModifierFlags.NonPublicAccessibilityModifier);
 
-            // Public constructor is accessible.
-            if (!modifiers) {
+            // (1) Public constructors and (2) constructor functions are always accessible.
+            if (!modifiers || declaration.kind !== SyntaxKind.Constructor) {
                 return true;
             }