Minor, remove unneeded check in ClosureCodegen

Actually we do need to generate delegates to DefaultImpls even for Java
SAM wrappers, so this condition is incorrect. However, this never worked
properly anyway because of KT-12466.

compiler/backend/src/org/jetbrains/kotlin/codegen/ClosureCodegen.java

@@ -27,7 +27,6 @@ import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.descriptors.impl.SimpleFunctionDescriptorImpl;
 import org.jetbrains.kotlin.incremental.components.NoLookupLocation;
 import org.jetbrains.kotlin.load.java.JvmAbi;
-import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor;
 import org.jetbrains.kotlin.load.kotlin.header.KotlinClassHeader;
 import org.jetbrains.kotlin.metadata.ProtoBuf;
 import org.jetbrains.kotlin.psi.KtElement;
@@ -187,10 +186,9 @@ public class ClosureCodegen extends MemberCodegen<KtElement> {
         generateClosureBody();
 
         if (samType != null) {
-            ClassDescriptor funInterface = samType.getClassDescriptor();
-            if (!(funInterface instanceof JavaClassDescriptor)) {
-                SamWrapperCodegen.generateDelegatesToDefaultImpl(asmType, classDescriptor, funInterface, functionCodegen, state);
-            }
+            SamWrapperCodegen.generateDelegatesToDefaultImpl(
+                    asmType, classDescriptor, samType.getClassDescriptor(), functionCodegen, state
+            );
         }
 
         this.constructor = generateConstructor();