[IR] Supported fake overrides in SAM lowering + enabled test

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/SingleAbstractMethodLowering.kt

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.backend.common.lower
 import org.jetbrains.kotlin.backend.common.CommonBackendContext
 import org.jetbrains.kotlin.backend.common.FileLoweringPass
 import org.jetbrains.kotlin.backend.common.IrElementTransformerVoidWithContext
+import org.jetbrains.kotlin.backend.common.ir.addFakeOverrides
 import org.jetbrains.kotlin.backend.common.ir.copyTo
 import org.jetbrains.kotlin.backend.common.ir.createImplicitParameterDeclarationWithWrappedDescriptor
 import org.jetbrains.kotlin.descriptors.ClassKind
@@ -207,6 +208,8 @@ abstract class SingleAbstractMethodLowering(val context: CommonBackendContext) :
             }
         }
 
+        subclass.addFakeOverrides()
+
         return subclass
     }
 }

compiler/testData/codegen/box/funInterface/funInterfaceInheritance.kt

@@ -1,6 +1,6 @@
 // !LANGUAGE: +NewInference +FunctionalInterfaceConversion +SamConversionPerArgument +SamConversionForKotlinFunctions
 
-// IGNORE_BACKEND: JVM, JVM_IR, JS_IR
+// IGNORE_BACKEND: JVM, JVM_IR
 // IGNORE_BACKEND_FIR: JVM_IR
 // SKIP_DCE_DRIVEN