FIR LC: add support for inline class

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/KtUltraInlineLightClass.kt

@@ -57,6 +57,9 @@ class KtUltraLightInlineClass(
         if (inlineClassParameter != null) {
             membersBuilder.propertyAccessors(
                 inlineClassParameter,
+                // (inline or) value class primary constructor must have only final read-only (val) property parameter
+                // Even though the property parameter is mutable (for some reasons, e.g., testing or not checked yet),
+                // we can enforce immutability here.
                 mutable = false,
                 forceStatic = false,
                 onlyJvmStatic = false