Minor. Add regression test for KT-59051

FIR2IR generates correct IR, unlike PSI2IR.
 #KT-59051 Fixed

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirLightTreeBlackBoxCodegenTestGenerated.java

@@ -16191,6 +16191,12 @@ public class FirLightTreeBlackBoxCodegenTestGenerated extends AbstractFirLightTr
             runTest("compiler/testData/codegen/box/delegation/differentModules.kt");
         }
 
+        @Test
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void testDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         @Test
         @TestMetadata("genericProperty.kt")
         public void testGenericProperty() throws Exception {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirLightTreeBlackBoxCodegenWithIrFakeOverrideGeneratorTestGenerated.java

@@ -16191,6 +16191,12 @@ public class FirLightTreeBlackBoxCodegenWithIrFakeOverrideGeneratorTestGenerated
             runTest("compiler/testData/codegen/box/delegation/differentModules.kt");
         }
 
+        @Test
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void testDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         @Test
         @TestMetadata("genericProperty.kt")
         public void testGenericProperty() throws Exception {

compiler/fir/fir2ir/tests-gen/org/jetbrains/kotlin/test/runners/codegen/FirPsiBlackBoxCodegenTestGenerated.java

@@ -16191,6 +16191,12 @@ public class FirPsiBlackBoxCodegenTestGenerated extends AbstractFirPsiBlackBoxCo
             runTest("compiler/testData/codegen/box/delegation/differentModules.kt");
         }
 
+        @Test
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void testDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         @Test
         @TestMetadata("genericProperty.kt")
         public void testGenericProperty() throws Exception {

compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt

@@ -0,0 +1,22 @@
+// TARGET_BACKEND: JVM
+// IGNORE_BACKEND_K1: JVM, JVM_IR
+
+interface A {
+    override operator fun equals(other: Any?): Boolean
+    override fun hashCode(): Int
+}
+
+class AImpl : A {
+    override fun equals(other: Any?) = super.equals(other)
+    override fun hashCode() = super.hashCode()
+}
+
+interface B
+class BImpl : B
+
+class Impl : A by AImpl(), B by BImpl()
+
+fun box(): String {
+    Impl()
+    return "OK"
+}

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/BlackBoxCodegenTestGenerated.java

@@ -15831,6 +15831,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             runTest("compiler/testData/codegen/box/delegation/differentModules.kt");
         }
 
+        @Test
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void testDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         @Test
         @TestMetadata("genericProperty.kt")
         public void testGenericProperty() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenTestGenerated.java

@@ -16191,6 +16191,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             runTest("compiler/testData/codegen/box/delegation/differentModules.kt");
         }
 
+        @Test
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void testDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         @Test
         @TestMetadata("genericProperty.kt")
         public void testGenericProperty() throws Exception {

compiler/tests-common-new/tests-gen/org/jetbrains/kotlin/test/runners/codegen/IrBlackBoxCodegenWithIrInlinerTestGenerated.java

@@ -16191,6 +16191,12 @@ public class IrBlackBoxCodegenWithIrInlinerTestGenerated extends AbstractIrBlack
             runTest("compiler/testData/codegen/box/delegation/differentModules.kt");
         }
 
+        @Test
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void testDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         @Test
         @TestMetadata("genericProperty.kt")
         public void testGenericProperty() throws Exception {

compiler/tests-gen/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -13262,6 +13262,11 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
     @TestDataPath("$PROJECT_ROOT")
     @RunWith(JUnit3RunnerWithInners.class)
     public static class Delegation extends AbstractLightAnalysisModeTest {
+        @TestMetadata("doubleDelegationEqualsHashcode.kt")
+        public void ignoreDoubleDelegationEqualsHashcode() throws Exception {
+            runTest("compiler/testData/codegen/box/delegation/doubleDelegationEqualsHashcode.kt");
+        }
+
         private void runTest(String testDataFilePath) throws Exception {
             KotlinTestUtils.runTest(this::doTest, TargetBackend.JVM_IR, testDataFilePath);
         }