[ULC] Add compiler flag -Xdisable-ultra-light-classes to fallback to light implementation in CLI

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/CommonCompilerArguments.kt

@@ -323,6 +323,12 @@ abstract class CommonCompilerArguments : CommonToolArguments() {
     )
     var useFirExtendedCheckers: Boolean by FreezableVar(false)
 
+    @Argument(
+        value = "-Xdisable-ultra-light-classes",
+        description = "Do not use the ultra light classes implementation"
+    )
+    var disableUltraLightClasses: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xuse-mixed-named-arguments",
         description = "Enable Support named arguments in their own position even if the result appears as mixed"

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -401,6 +401,7 @@ class K2JVMCompilerArguments : CommonCompilerArguments() {
         result[JvmAnalysisFlags.suppressMissingBuiltinsError] = suppressMissingBuiltinsError
         result[JvmAnalysisFlags.irCheckLocalNames] = irCheckLocalNames
         result[AnalysisFlags.reportErrorsOnIrDependencies] = !useIR && !useFir && !allowJvmIrDependencies
+        result[JvmAnalysisFlags.disableUltraLightClasses] = disableUltraLightClasses
         return result
     }
 

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/CliLightClassGenerationSupport.kt

@@ -103,6 +103,9 @@ class CliLightClassGenerationSupport(
         return ultraLightSupport
     }
 
+    override val useUltraLightClasses: Boolean
+        get() = !KtUltraLightSupport.forceUsingOldLightClasses && !traceHolder.languageVersionSettings.getFlag(JvmAnalysisFlags.disableUltraLightClasses)
+
     override fun createDataHolderForClass(classOrObject: KtClassOrObject, builder: LightClassBuilder): LightClassDataHolder.ForClass {
         //force resolve companion for light class generation
         traceHolder.bindingContext.get(BindingContext.CLASS, classOrObject)?.companionObjectDescriptor