[JS IR] Cleanup BackendContext flags

js/js.tests/test/org/jetbrains/kotlin/js/test/AbstractJsKLibABITestCase.kt

@@ -203,8 +203,7 @@ abstract class AbstractJsKLibABITestCase : KtUsefulTestCase() {
             PhaseConfig(jsPhases),
             IrFactoryImplForJsIC(WholeWorldStageController()),
             exportedDeclarations = setOf(BOX_FUN_FQN),
-            granularity = JsGenerationGranularity.PER_MODULE,
-            icCompatibleIr2Js = true
+            granularity = JsGenerationGranularity.PER_MODULE
         )
 
         val transformer = IrModuleToJsTransformerTmp(

js/js.tests/test/org/jetbrains/kotlin/js/test/converters/JsIrBackendFacade.kt

@@ -143,11 +143,9 @@ class JsIrBackendFacade(
             keep = keep,
             dceRuntimeDiagnostic = null,
             es6mode = false,
-            baseClassIntoMetadata = false,
             safeExternalBoolean = JsEnvironmentConfigurationDirectives.SAFE_EXTERNAL_BOOLEAN in module.directives,
             safeExternalBooleanDiagnostic = module.directives[JsEnvironmentConfigurationDirectives.SAFE_EXTERNAL_BOOLEAN_DIAGNOSTIC].singleOrNull(),
             granularity = granularity,
-            icCompatibleIr2Js = true,
         )
 
         return loweredIr2JsArtifact(module, loweredIr, granularity)