Add test for generic setValue called via synthetic accessor

Synthetic accessor for 'setValue' was generated incorrectly,
specific case of KT-20491 (Incorrect synthetic accessor generated for a
generic base class function specialized with primitive type).

Make sure there's no equivalent of KT-20387 for delegated properties.

compiler/testData/codegen/box/delegatedProperty/genericSetValueViaSyntheticAccessor.kt

@@ -0,0 +1,25 @@
+// FILE: Var.kt
+package pvar
+
+open class PVar<T>(private var value: T) {
+    protected operator fun getValue(thisRef: Any?, prop: Any?) = value
+
+    protected operator fun setValue(thisRef: Any?, prop: Any?, newValue: T) {
+        value = newValue
+    }
+}
+
+// FILE: test.kt
+import pvar.*
+
+class C : PVar<Long>(42L) {
+    inner class Inner {
+        var x by this@C
+    }
+}
+
+fun box(): String {
+    val inner = C().Inner()
+    inner.x = 1L
+    return "OK"
+}

compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -6923,6 +6923,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
             throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
         }
 
+        @TestMetadata("genericSetValueViaSyntheticAccessor.kt")
+        public void testGenericSetValueViaSyntheticAccessor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/genericSetValueViaSyntheticAccessor.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("getAsExtensionFun.kt")
         public void testGetAsExtensionFun() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/getAsExtensionFun.kt");

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -6923,6 +6923,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
             throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
         }
 
+        @TestMetadata("genericSetValueViaSyntheticAccessor.kt")
+        public void testGenericSetValueViaSyntheticAccessor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/genericSetValueViaSyntheticAccessor.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("getAsExtensionFun.kt")
         public void testGetAsExtensionFun() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/getAsExtensionFun.kt");

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

@@ -6923,6 +6923,12 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
             doTest(fileName);
         }
 
+        @TestMetadata("genericSetValueViaSyntheticAccessor.kt")
+        public void testGenericSetValueViaSyntheticAccessor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/genericSetValueViaSyntheticAccessor.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("getAsExtensionFun.kt")
         public void testGetAsExtensionFun() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/getAsExtensionFun.kt");

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -7619,6 +7619,12 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
             throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
         }
 
+        @TestMetadata("genericSetValueViaSyntheticAccessor.kt")
+        public void testGenericSetValueViaSyntheticAccessor() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/genericSetValueViaSyntheticAccessor.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("getAsExtensionFun.kt")
         public void testGetAsExtensionFun() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/delegatedProperty/getAsExtensionFun.kt");