JVM IR: don't generate ACC_FINAL on DefaultImpls methods

To replicate behavior of old backend

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt

@@ -515,6 +515,7 @@ fun createStaticFunctionWithReceivers(
     oldFunction: IrFunction,
     dispatchReceiverType: IrType? = oldFunction.dispatchReceiverParameter?.type,
     origin: IrDeclarationOrigin = oldFunction.origin,
+    modality: Modality = Modality.FINAL,
     copyBody: Boolean = true
 ): IrSimpleFunction {
     val descriptor = WrappedSimpleFunctionDescriptor(Annotations.EMPTY, oldFunction.descriptor.source)
@@ -524,7 +525,7 @@ fun createStaticFunctionWithReceivers(
         IrSimpleFunctionSymbolImpl(descriptor),
         name,
         oldFunction.visibility,
-        Modality.FINAL,
+        modality,
         oldFunction.returnType,
         isInline = oldFunction.isInline,
         isExternal = false, isTailrec = false, isSuspend = false

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/descriptors/JvmDeclarationFactory.kt

@@ -151,7 +151,9 @@ class JvmDeclarationFactory(
                     interfaceFun.origin != IrDeclarationOrigin.FAKE_OVERRIDE -> interfaceFun.origin
                     interfaceFun.resolveFakeOverride()!!.origin.isSynthetic -> JvmLoweredDeclarationOrigin.DEFAULT_IMPLS_BRIDGE_TO_SYNTHETIC
                     else -> JvmLoweredDeclarationOrigin.DEFAULT_IMPLS_BRIDGE
-                }
+                },
+                // Old backend doesn't generate ACC_FINAL on DefaultImpls methods.
+                modality = Modality.OPEN
             )
         }
     }